[Pediatric supratentorial brain tumors]. / Supratentorielle Hirntumoren im Kindesalter.

BACKGROUND: Pediatric brain tumors differ regarding location and histopathological features compared to those in adults. In children, 30% of pediatric brain tumors are supratentorial lesions. Low-grade astrocytomas, e.g. pilocystic astrocytoma or craniopharyngioma, are the most common tumors. IMAGING MODALITIES: Magnetic resonance imaging (MRI) is the default imaging technique that is used to evaluate the findings. Ultrasound and cranial computed tomography (CCT) accompany the imaging, although CCT is mainly used in emergency situations. TOPICS COVERED: The following article describes the most common pediatric supratentorial brain tumors with reference to imaging criteria as well as changes in the World Health Organization (WHO) classification.

Preoperative antiepileptic drug prophylaxis for early postoperative seizures in supratentorial meningioma: a single-center experience.

OBJECTIVE: Perioperative antiepileptic drug (AED) prophylaxis for early postoperative seizures (EPSs) in patients with supratentorial meningiomas without preoperative seizures is controversial. This paper discusses the incidence, risk factors, control rate and AED withdrawal indications of EPS in patients undergoing supratentorial convexity and parasagittal/falx meningioma resection without preoperative seizures. METHODS: Patients treated for a histologically confirmed supratentorial convexity and parasagittal/falx meningioma at the authors' institution between 2015 and 2021 were retrospectively examined. Clinical and imaging data were assessed. Variates were analyzed using univariate and multivariate regression analyses. A PubMed review of the literature published between 2011 and 2021 was performed. RESULTS: In total, 517 patients met the selection criteria. EPS (within the first postoperative week) was observed in 30/517 cases (5.8%). Multivariate analysis revealed that surgical/medical complications (OR 16.33, 95% CI 7.07-37.7, P < 0.001) were the only independent predictors of EPS. The dose of valproic was increased and levetiracetam was added based on the frequency of seizures (≤ 2, > 2 times and status epilepticus). EPS control rates were 94.1% (16/17) and 92.3% (12/13), respectively. AEDs were discontinued at 2 weeks and 4-6 weeks, respectively. The authors identified 10 relevant studies in the literature. Based on their review of the literature, the incidence of EPS was 3.7% (47/1282) with AED use and 6.2% (95/1525) without AED use patients in supratentorial meningiomas without preoperative seizures. The incidence of EPS was 9.0% (19/209) in patients without AED use with convexity and parasagittal/falx meningiomas without preoperative seizures. CONCLUSIONS: AED prophylaxis can reduce the incidence of EPS in patients with convexity and parasagittal/falx meningiomas without preoperative seizures. Avoiding postoperative complications is an important means to prevent EPS. Combined medication has a significant effect on controlling repeated EPS. The timing of AED withdrawal was evaluated according to the clinical symptoms and imaging findings.

Transcriptional profiling of paediatric ependymomas identifies prognostically significant groups.

The majority of supratentorial ependymomas in children contain oncogenic fusions, such as ZFTA-RELA or YAP1-MAMLD1. In contrast, posterior fossa (PF) ependymomas lack recurrent somatic mutations and are classified based on gene expression or methylation profiling into group A (PFA) and group B (PFB). We have applied a novel method, NanoString nCounter Technology, to identify four molecular groups among 16 supratentorial and 50 PF paediatric ependymomas, using 4-5 group-specific signature genes. Clustering analysis of 16 supratentorial ependymomas revealed 9 tumours with a RELA fusion-positive signature (RELA+), 1 tumour with a YAP1 fusion-positive signature (YAP1+), and 6 not-classified tumours. Additionally, we identified one RELA+ tumour among historically diagnosed CNS primitive neuroectodermal tumour samples. Overall, 9 of 10 tumours with the RELA+ signature possessed the ZFTA-RELA fusion as detected by next-generation sequencing (p = 0.005). Similarly, the only tumour with a YAP1+ signature exhibited the YAP1-MAMLD1 fusion. Among the remaining unclassified ependymomas, which did not exhibit the ZFTA-RELA fusion, the ZFTA-MAML2 fusion was detected in one case. Notably, among nine ependymoma patients with the RELA+ signature, eight survived at least 5 years after diagnosis. Clustering analysis of PF tumours revealed 42 samples with PFA signatures and 7 samples with PFB signatures. Clinical characteristics of patients with PFA and PFB ependymomas corroborated the previous findings. In conclusion, we confirm here that the NanoString method is a useful single tool for the diagnosis of all four main molecular groups of ependymoma. The differences in reported survival rates warrant further clinical investigation of patients with the ZFTA-RELA fusion.

A Rare Case of Medulloblastoma with Supratentorial Metastasis Two Years after Treatment

One of the most invasive malignant tumors of the cerebellum is medulloblastoma, which is also the most common malignant tumor of the brain in children. Patients with a recurrent disease following initial treatment have the most unfavorable prognosis. The most common metastasis locations are the spine, the posterior fossa, the bones, and the supratentorium. Late medulloblastoma metastasis in the supratentorial intraventricular region is uncommon. We report here a case with supratentorial seeding.

Glioblastoma survival is better analyzed on preradiotherapy MRI than on postoperative MRI residual volumes: A retrospective observational study.

OBJECTIVES: Establishing an overall survival prognosis for resected glioblastoma during routine postoperative management remains a challenge. The aim of our single-center study was to assess the usefulness of basing survival analyses on preradiotherapy MRI (PRMR) rather than on postoperative MRI (POMR). PATIENTS AND METHODS: A retrospective review was undertaken of 75 patients with glioblastoma treated at our institute. We collected overall survival and MRI volumetric data. We analyzed two types of volumetric data: residual tumor volume and extent of resection. Overall survival rates were compared according to these two types of volumetric data, calculated on either POMR or PRMR and according to the presence or absence of residual enhancement. RESULTS: Analysis of volumetric data revealed progression of some residual tumors between POMR and PRMR. Kaplan-Meier analysis of the correlations between extent of resection, residual tumor volume, and overall survival revealed significant differences between POMR and PRMR data. Both MRI scans indicated a difference between the complete resection subgroup and the incomplete resection subgroup, as median overall survival was longer in patients with complete resection. However, differences were significant for PRMR (25.3 vs. 15.5, p =  0.012), but not for POMR (21.3 vs. 15.8 months, p =  0.145). With a residual tumor volume cut-off value of 3 cm3, Kaplan-Meier survival analysis revealed non-significant differences on POMR (p =  0.323) compared with PRMR (p =  0.007). CONCLUSION: Survival in patients with resected glioblastoma was more accurately predicted by volumetric data acquired with PRMR. Differences in predicted survival between the POMR and PRMR groups can be attributed to changes in tumor behavior before adjuvant therapy.

Angiocentric glioma: Drop Metastases to the Spinal Cord.

BACKGROUND: Angiocentric glioma (AG) is an epileptogenic low grade (World Health Organization grade I) glial tumor with astrocytic and ependymal differentiation, most commonly affecting the pediatric and adolescent population. Despite its infiltrating histological growth kinetics, it is widely accepted that AG has a low potential for aggressive behavior. CASE DESCRIPTION: We present the case of a 42-year-old man who represents the first documented case of not only extracranial manifestation of AG, but also spinal metastatic dissemination. Our patient initially presented with a generalized tonic clonic seizure; following a biopsy, he was diagnosed with a low-grade supratentorial astrocytoma and subsequently received fractionated radiotherapy. He presented 10 months later with worsening dorsal column symptoms and was found to have a contrast-enhancing intradural extramedullary lesion that was surgically resected and histologically confirmed as an AG. CONCLUSION: Further research is required to examine the microenvironment and potential for malignant change in this tumor.

Brain glucose metabolism in patients with newly diagnosed multiple myeloma significantly decreases after high-dose chemotherapy followed by autologous stem cell transplantation.

PURPOSE: The aim of this study was to compare the effect of intensive therapy [consisting of high-dose chemotherapy followed by autologous stem cell transplantation (HDC/ASCT)] and conventional standard-dose chemotherapy (CDC) on brain FDG uptake, as an indicator of glucose metabolism, in multiple myeloma patients. MATERIALS AND METHODS: Twenty-four patients with newly diagnosed multiple myeloma were included. Sixteen patients received HDC/ASCT, including bortezomib-based induction therapy, and eight patients received CDC. F-fluorodeoxyglucose (FDG)-PET/computed tomography (CT) was performed 1 and 3 hours following tracer administration before and after the treatment. The manual segmentation of supratentorial and cerebellum of each patient was performed by two independent observers. The data were expressed as global mean standardized uptake values (GSUVmean). Wilcoxon signed-rank test was used to compare changes from before to after treatment. RESULTS: A significant decrease in the GSUVmean of supratentorial brain and cerebellum was observed after treatment in the patients who received HDC/ASCT (1 hour scans: 7.03 ± 1.18 vs. 6.56 ± 0.94; P = 0.03 and 7.01 ± 1.08 vs. 6.34 ± 0.93; P = 0.01, respectively). GSUVmean changes in the patients who received CDC were not significantly different after treatment (1 hour scans: 6.47 ± 1.16 vs. 6.21 ± 0.91; P = 0.40 and 6.30 ± 1.21 vs. 6.09 ± 0.86; P = 0.62, respectively). The same findings were observed for 3 hours scans. A high level of agreement was observed between two operators. CONCLUSION: Multiple myeloma patients who received HDC/ASCT demonstrated a significant decrease in FDG uptake in the supratentorial brain and cerebellum, while patients who received CDC did not demonstrate significant changes in the brain FDG uptake.

Prognostic value of H3K27me3 in children with ependymoma.

OBJECTIVE: To investigate the expression of H3K27me3 in different anatomical sites and analyze its prognostic value in children with ependymoma. METHODS: A total of 188 children diagnosed with ependymoma were admitted to the Department of Neurosurgery, Beijing Tiantan Hospital, Capital Medical University, between 2012 and 2017, and regular follow-up was conducted. Expression of H3K27me3 was analyzed by immunohistochemistry and scored semiquantitatively. The prognostic correlation was analyzed by Kaplan-Meier and Cox regression survival analyses. RESULTS: Of the 188 children with ependymoma, 61.7% were male, and the median and average age was five years (0-17 years) and 6.26 years, respectively. There were 65 cases of supratentorial ependymoma, 115 cases of infratentorial ependymoma, and 8 cases of spinal cord ependymoma. The median follow-up time was 39.95 months (0.3-90.19 months). Five-year progression-free survival (PFS) and overall survival (OS) were 48.5% and 61.4%, respectively. Kaplan-Meier univariate survival analysis showed that H3K27me3 expression had significant effects on PFS (P = 0.0003) and OS (P < 0.0001) in infratentorial ependymoma, but only affected OS (P = 0.03) in supratentorial ependymoma. CONCLUSION: In Chinese children, infratentorial ependymoma with incomplete resection and no adjuvant radiotherapy is associated with poor OS. On the other hand, low expression of H3K27me3 indicates poor prognosis of infratentorial ependymoma, but it has no significant prognostic value for supratentorial ependymoma. In addition, high expression of H3K27me3 in spinal ependymoma may indicate a better prognosis.

Influence of wide opening of the lateral ventricle on survival for supratentorial glioblastoma patients with radiotherapy and concomitant temozolomide-based chemotherapy.

The prognosis for glioblastoma (GBM) varies among patients. Ventricular opening during surgery has been reported as a prognostic factor for GBM patients, but the influence of ventricular opening itself on patient prognosis remains controversial. We presumed that the degree of ventricular opening would correlate with the degree of subventricular zone (SVZ) resection and with prognosis in GBM patients. This study therefore investigated whether the degree of ventricular opening correlates with prognosis in GBM patients treated with the standard protocol of chemo-radiotherapy. Participants comprised 111 patients with newly diagnosed GBM who underwent surgery and received postoperative radiotherapy and temozolomide-based chemotherapy from 2005 to 2018. We classified 111 patients into "No ventricular opening (NVO)", "Ventricular opening, small (VOS; distance < 23.2 mm)", and "Ventricular opening, wide (VOW; distance ≥ 23.2 mm)" groups. We evaluated the relationship between degree of ventricular opening and prognosis using survival analyses that included other clinicopathological factors. Log-rank testing revealed age, Karnofsky performance status (KPS), extent of resection, O6-methylguanine-DNA methyltransferase (MGMT) status, isocitrate dehydrogenase (IDH)1 mutation, and degree of ventricular opening correlated significantly with overall survival. Multivariate analysis identified the degree of ventricular opening (small vs. wide) as the most significant prognostic factor (hazard ratio = 3.674; p < 0.0001). We demonstrated that wide opening of the lateral ventricle (LV) contributes to longer survival compared with small opening among GBM patients. Our results indicate that wide opening of the LV may correlate with the removal of a larger proportion of tumor stem cells from the SVZ.

Tumor treating fields for glioblastoma: should it or will it ever be adopted?

PURPOSE OF REVIEW: The purpose of this review is to discuss how a new treatment modality, tumor treating fields, may be incorporated into the oncologic care for patients with glioblastoma. RECENT FINDINGS: Tumor treating fields are a new treatment modality available to patients with newly diagnosed and recurrent glioblastoma. Alternating electric fields are delivered via a wearable, removable device affixed to the scalp of patients with supratentorial glioblastoma. With continuous use, the application of tumor treating fields combined with temozolomide chemotherapy has been shown to improve overall survival compared with temozolomide alone in patients with newly diagnosed glioblastoma. Adverse events attributable to the device are limited to localized skin reactions. Despite compendium guidelines in support of its use and Food and Drug Administration (FDA) approval, tumor treating fields have been slow to be adopted in the neuro-oncology community. Critics have raised concerns about the generalizability of the study data, patient quality of life, and mechanism of action of this therapy. SUMMARY: Tumor treating fields are available for the treatment of both newly diagnosed and recurrent glioblastoma and represent a new category of treatment modalities in oncologic therapy. This novel device has received FDA approval but has been slow to be adopted into clinical practice.

Children treated for medulloblastoma and supratentorial primitive neuroectodermal tumor in Norway from 1974 through 2013: Unexplainable regional differences in survival.

BACKGROUND: A previous study based on Norwegian Cancer Registry data suggested regional differences in overall survival (OS) after treatment for medulloblastoma (MB) and supratentorial primitive neuroectodermal tumor (CNS-PNET) in Norway. The purpose of the present study was to confirm in an extended cohort whether there were regional differences in outcome or not, and if so try to identify possible explanations. MATERIAL AND METHODS: Data from patients aged 0-20 years diagnosed with and treated for MB/CNS-PNET at all four university hospitals in Norway from 1974 to 2013 were collected and compared. RESULTS: Of 266 identified patients, 251 fulfilled inclusion criteria. MB was diagnosed in 200 and CNS-PNET in 51 patients. Five-year OS and event-free survival (EFS) were 59% and 52%, respectively. There was a significant difference in five-year OS and EFS between MB and CNS-PNET patients; 62% versus 47% (P =  0.007) and 57% versus 35% (P < 0.001). In multivariable analysis, two factors were found to significantly contribute to improved five-year OS and EFS, whereas one factor contributed to improved five-year OS only. Gross total resection (GTR) versus non-GTR (hazard ratio [HR] 0.53, P =  0.003; HR 0.46, P < 0.001) and cerebrospinal irradiation (CSI) versus non-CSI (HR 0.24, P < 0.001; HR 0.28, P < 0.001) for both, and treatment outside Oslo University Hospital for OS only (HR 0.64, P =  0.048). CONCLUSION: Survival was comparable with data from other population-based studies, and the importance of GTR and CSI was confirmed. The cause for regional survival differences could not be identified.

Conformal Radiation Therapy for Pediatric Ependymoma, Chemotherapy for Incompletely Resected Ependymoma, and Observation for Completely Resected, Supratentorial Ependymoma.

PURPOSE: The Children's Oncology Group trial ACNS0121 estimated event-free survival (EFS) and overall survival for children with intracranial ependymoma treated with surgery, radiation therapy, and-selectively-with chemotherapy. Treatment was administered according to tumor location, histologic grade, and extent of resection. The impacts of histologic grade, focal copy number gain on chromosome 1q, and DNA methylation profiles were studied for those undergoing surgery and immediate postoperative conformal radiation therapy (CRT). METHODS: ACNS0121 included 356 newly diagnosed patients (ages 1 to 21 years). Patients with classic supratentorial ependymoma were observed after gross total resection (GTR). Those undergoing subtotal resection received chemotherapy, second surgery, and CRT. The remaining patients received immediate postoperative CRT after near-total resection or GTR. CRT was administered with a 1.0-cm clinical target volume margin. The cumulative total dose was 59.4 Gy, except for patients who underwent GTR and were younger than age 18 months (who received 54 Gy). Patients were enrolled between October 2003 and September 2007 and were observed for 5 years. Supratentorial tumors were evaluated for RELA fusion; infratentorial tumors, for chromosome 1q gain. Classification of posterior fossa groups A and B was made by methylation profiles. RESULTS: The 5-year EFS rates were 61.4% (95% CI, 34.5% to 89.6%), 37.2% (95% CI, 24.8% to 49.6%), and 68.5% (95% CI, 62.8% to 74.2%) for observation, subtotal resection, and near-total resection/GTR groups given immediate postoperative CRT, respectively. The 5-year EFS rates differed significantly by tumor grade (P = .0044) but not by age, location, RELA fusion status, or posterior fossa A/posterior fossa B grouping. EFS was higher for patients with infratentorial tumors without 1q gain than with 1q gain (82.8% [95% CI, 74.4% to 91.2%] v 47.4% [95% CI, 26.0% to 68.8%]; P = .0013). CONCLUSION: The EFS for patients with ependymoma younger than 3 years of age who received immediate postoperative CRT and for older patients is similar. Irradiation should remain the mainstay of care for most subtypes.

Malignancy Index Using Intraoperative Flow Cytometry is a Valuable Prognostic Factor for Glioblastoma Treated With Radiotherapy and Concomitant Temozolomide.

BACKGROUND: Intraoperative prediction of radiochemosensitivity is desirable for improving the clinical management of glioblastoma (GBM) patients. We have previously developed an original technique for intraoperative flow cytometry (iFC) and defined a malignancy index (MI). OBJECTIVE: To determine whether MI correlates with prognosis in GBM patients who underwent the standard treatment protocol of radiotherapy and temozolomide administration. METHODS: The current study included 102 patients with GBM that had been newly diagnosed from 2010 to 2015 who underwent our iFC analysis and received the standard treatment protocol. We evaluated MI values in each patient, then statistically analyzed the relationship between MI and prognosis using survival analysis that include other clinicopathological factors (age, sex, Karnofsky performance status [KPS], extent of resection, second-line bevacizumab, O6-methylguanine-DNA methyltransferase [MGMT] status, MIB-1 labeling index, and mutation of the isocitrate dehydrogenase 1 gene [IDH1]). RESULTS: Log-rank test revealed that age, KPS, extent of resection, MGMT status, IDH1 mutation, and high MI (≥26.3%) significantly correlated with overall survival. Multivariate analysis with Cox regression modeling identified MI as the most significant prognostic factor (hazard ratio = 2.246; 95% confidence interval = 1.347-3.800; P = .0019). MI showed strong correlation with IDH1 mutation status in chi-square test (P = .0023). In addition, log-rank test revealed that MI affects overall survival more strongly in patients with IDH1 wildtype than those with IDH1 mutant. CONCLUSION: MI from an iFC study may help predict the prognosis in patients with GBM who receive the standard treatment. Survival can be related to sensitivity to radio-chemotherapy.

Stereotactic Placement of Intratumoral Catheters for Continuous Infusion Delivery of Herpes Simplex Virus -1 G207 in Pediatric Malignant Supratentorial Brain Tumors.

OBJECTIVE: The engineered herpes simplex virus-1 G207, is a promising therapeutic option for central nervous system tumors. The first-ever pediatric phase 1 trial of continuous-infusion delivery of G207 via intratumoral catheters for recurrent or progressive malignant brain tumors is ongoing. In this article, we describe surgical techniques for the accurate placement of catheters in multiple supratentorial locations and perioperative complications associated with such procedures. METHODS: A prospective study of G207 in children with recurrent malignant supratentorial tumors is ongoing. Preoperative stereotactic protocol magnetic resonance imaging was performed, and catheter trajectories planned using StealthStation planning software. Children underwent placement of 3-4 silastic catheters using a small incision burr hole and the Vertek system. Patients had a preinfusion computed tomography scan to confirm correct placement of catheters. RESULTS: Six children underwent implantation of 3-4 catheters. Locations of catheter placement included frontal, temporal, parietal, and occipital lobes, and the insula and thalamus. There were no clinically significant perioperative complications. Postoperative computed tomography scans coupled with preoperative MRI scans demonstrated accurate placement of 21 of 22 catheters, with 1 misplaced catheter pulled back to an optimal location at the bedside. One patient had hemorrhage along the catheter tract that was clinically asymptomatic. Another patient had cerebrospinal fluid leak from a biopsy incision 9 days after surgery that was oversewn without complication. CONCLUSIONS: The placement of multiple intratumoral catheters in pediatric patients with supratentorial tumors via frameless stereotactic techniques is feasible and safe. Intratumoral catheters provide a potentially effective route for the delivery of G207 and may be employed in other trials utilizing oncolytic virotherapy for brain tumors.

Posterior fossa recurrence of WHO grade II and III supratentorial gliomas.

OBJECTIVE/BACKGROUND: Posterior fossa (PF) recurrences of supratentorial (ST) World Health Organization (WHO) grade II and III gliomas are thought to be rare and to have grim prognoses. METHODS: This study entailed searching through our database and reviewing the records of patients with grade II and III ST gliomas who developed PF recurrence with no overt secondary gliomatosis or leptomeningeal spread. RESULTS: Of 2266 grade II and III gliomas, 14 fulfilled the inclusion criteria: 5 oligodendrogliomas (O; 1 OII, 4 OIII); 7 astrocytomas (A; 4 AII, 3 AIII); and 2 oligoastrocytomas (OA; both OAIII). The male/female gender ratio was 10/4, and median age at recurrence was 43 years. Two groups were identified. In one group (n=8; 1 AII, 3 AIII, 2 OAIII, 2 OIII), a rapidly growing contrast-enhancing PF mass (6/8) was associated with ST progression, and median survival time after detection was only 6.5 months despite radiotherapy and/or chemotherapy. In the second group (n=6; 3 AII, 1 OII, and 2 OIII), a non-contrast-enhancing (5/6), asymptomatic (5/6), slow-growing PF mass remained isolated, and treatment with radio- or chemotherapy produced objective responses in three patients and durable stabilization in the remaining three. After a median follow-up of 63months, only one patient died due to delayed recurrence of the ST lesion, while the remaining five patients are still alive. CONCLUSION: Non-contiguous PF relapses of ST grade II and III gliomas are rare. A high-grade ST tumor that is concomitantly progressing appears to be a predictor of poor survival. Conversely, the tumor course may be indolent if the ST lesion is low-grade and non-progressive at the time of PF involvement. The possible mechanism(s) behind this tropism are also discussed.

Pediatric Case of Li-Fraumeni Syndrome Complicated with Supratentorial Anaplastic Ependymoma.

BACKGROUND: Li-Fraumeni syndrome is a genetic disease that is caused by mutation of the tumor suppressor gene TP53. Patients with this syndrome may develop multiple malignant neoplasms including brain tumors. We herein report the first case of Li-Fraumeni syndrome in which development of supratentorial anaplastic ependymoma led to difficulty in terms of selecting the optimal postoperative therapeutic protocol. CASE DESCRIPTION: A 7-year-old boy experiencing a convulsive attack was brought to our institute. He underwent surgical tumor resection, and magnetic resonance imaging of the head revealed a tumor-like lesion in the right parietal lobe. Although adjuvant radiotherapy was performed after total tumor resection, a focal recurrent lesion appeared soon afterward. We initiated chemotherapy with bevacizumab after resection of the recurrent lesion, but bevacizumab was unable to control tumor progression. At this writing, he remains bedridden and requires tube feeding and artificial ventilation. CONCLUSION: Since Li-Fraumeni syndrome is a genetic disease that is caused by mutation of the tumor suppression gene TP53, patients should generally not be treated with radiotherapy or alkylating agents that induce deoxyribonucleic acid damage. However, if the prognostic benefit of postoperative adjuvant therapies is thought to surpass the risk of long-term secondary cancer, it is appropriate to consider these therapies after consultation with the patient and family. Postoperative treatment protocols are controversial, and their role should be further explored in cases of Li-Fraumeni syndrome complicated with malignant gliomas.

Extensive Leptomeningeal Intracranial and Spinal Metastases in a Patient with a Supratentorial Glioblastoma Multiforme, IDH-Wildtype.

BACKGROUND: Glioblastoma multiforme (GBM) is usually characterized by diffuse, infiltrative growth and local tumor progression. Extensive leptomeningeal metastases are rarely observed. It is unclear which GBMs are prone to this specific growth pattern and progression, and standardized salvage treatment protocols are unavailable. CASE DESCRIPTION: In a 45-year-old man without focal neurologic deficit, a right temporal GBM, IDH-wildtype (biomarkers MGMT promoter methylation negative, Ki-67 proliferation rate 70%) was diagnosed. Gross tumor resection followed by concomitant and adjuvant radiotherapy and chemotherapy with temozolomide was performed. Routine follow-up imaging 8 months later showed a right parietal meningeal tumor. Resection confirmed a distant GBM, and next-generation sequencing revealed high tumor mutational burden, high-frequency microsatellite instability, and a pharmacologically targetable KIT mutation. Complete neuraxis imaging revealed multiple contrast-enhancing tumors in the craniocervical junction and levels C7, Th8-Th11, and S1. The craniocervical tumors and the cervical spine from C1-C2 were irradiated as palliative care, and second-line combined chemotherapy and antiangiogenic therapy with irinotecan and bevacizumab was initiated, which was later changed to an immune-checkpoint blockade with pembrolizumab in combination with bevacizumab owing to tumor progression. Tumor growth was slowed, but the patient eventually developed a progressive paraparesis. Subsequent KIT-targeting tyrosine kinase inhibitor therapy with imatinib was administered for a short time. The patient died 13.8 months after initial diagnosis. CONCLUSIONS: High-risk genetic profiles for GBMs prone to develop extensive leptomeningeal metastases need to be identified. Guidelines on preemptive, complete neuraxis imaging in certain patients with GBM as well as treatment guidelines need to be developed.

Longitudinal Imaging of Tumor Volume, Diffusivity, and Perfusion After Preoperative Endovascular Embolization in Supratentorial Hemispheric Meningiomas.

OBJECTIVE: To describe longitudinal image changes in supratentorial hemispheric meningiomas based on magnetic resonance imaging after preoperative embolization using calibrated microspheres. METHODS: A total of 14 patients with symptomatic supratentorial meningiomas were included in a prospective, mono-centric, mono-arm study. Magnetic resonance imaging changes on diffusion-weighted imaging, dynamic contrast susceptibility-perfusion-weighted imaging, susceptibility-weighted imaging, and magnetization-prepared rapid acquisition gradient-echo sequence T1-weighted postcontrast sequences 6 and 48 hours after embolization were evaluated and correlated with angiographic and clinical data. RESULTS: The mean age of the patients was 63 ± 12.7 years with an equal female/male ratio. Twelve meningiomas were World Health Organization grade I and II tumors. After embolization, baseline apparent diffusion coefficient (901 ± 166 mm2/s) decreased significantly within 6 hours (696 ± 115 mm2/s, P = 0.0008) as well within 48 hours (752 ± 134 mm2/s; P = 0.0147). Baseline mean ratio of relative cerebral blood volume (rCBV)tumor/rCBVwhite matter (3.67 ± 1.83) and relative cerebral blood flow (rCBF)tumor/rCBFwhite matter (2.89 ± 1.57) significantly decreased after embolization within 6 hours (rCBVtumor/rCBVwhite matter of 1.45 ± 0.9; P = 0.0007, rCBF of 1.16 ± 0.68; P = 0.0029) and 48 hours (rCBV of 1.50 ± 1.07; P = 0.0009, rCBFtumor/rCBFwhite matter of 1.19 ± 0.8; P = 0.003). The viable enhanced baseline mean tumor volume (54.3 ± 34.9 mm3) was sustainably and significantly diminished within 6 hours (26.6 ± 20.8 mm3; P = 0.02) and 48 hours (29.7 ± 22.5 mm3; P = 0.035) after embolization. There was a good correlation between angiographic devascularization rate and the embolized tumor volume at 6 hours (r = 0.7; P = 0.03) and 48 hours (r = 0.78; P = 0.041). CONCLUSIONS: Preoperative meningioma embolization with calibrated microspheres is safe and effectively induces a significant and sustainable tissue transformation over 48 hours.

Clinical prognostic value of the isocitrate dehydrogenase 1 single-nucleotide polymorphism rs11554137 in glioblastoma.

The presence of the single-nucleotide polymorphism (SNP) rs11554137:C>T in the IDH1 gene is associated with a significantly lower survival in acute myeloid leukemia patients. The impact of its presence in glioblastoma on patient survival is unclear. We retrospectively reviewed 171 adult (> 18 years of age) patients treated at a single, tertiary academic center for supratentorial glioblastoma (WHO grade IV) between 2013 and 2017. We conducted Kaplan-Meier overall and progression free survival analyses based on the IDH1 and IDH2 gene status of patients' glioblastoma (IDH wild type, mutant, and IDH1 rs11554137:C>T SNP). Multivariate Cox survival analyses were conducted accounting for age at diagnosis, preoperative Karnofsky performance status score, treatment (extent of resection, postoperative radiotherapy, and temozolomide), IDH gene variant, and MGMT promoter methylation status. Presence of rs11554137:C>T SNP in glioblastoma samples did not correlate with presence of IDH1 mutation. Patients with rs11554137:C>T SNP did not have histories of prior lower-grade gliomas. Patients with IDH mutant glioblastoma had a distinctly higher survival profile than both rs11554137:C>T SNP and IDH wild type glioblastomas. No survival difference was noted between patients with glioblastoma harboring the SNP and patients with IDH wild type glioblastoma. In this study, clinical prognostication in glioblastoma patients was largely dependent on the classification of IDH mutant and wild type glioblastoma, and not on the presence of IDH1 rs11554137:C>T SNP in the tumor.

Supratentorial Cortical Ependymomas: A Retrospective Series of 13 Cases at a Single Center.

OBJECTIVE: Cortical ependymomas (CEs), supratentorial ependymomas that selectively involve the cerebral cortex, are relatively rare neoplasms that have not been extensively described. The purpose of our study was to identify the clinical features, radiologic characteristics, and treatment of a series of such tumors. METHODS: Thirteen patients with CEs from our hospital were included in this study. Epidemiologic characteristics, clinical features, imaging findings, treatment methods, and clinical outcomes were reviewed retrospectively. RESULTS: The patients consisted of 7 men and 6 women with mean age of 31.1 ± 23.2 years (range, 4-74 years). The most common clinical manifestation was seizure (n = 11; 85%), followed by headache (n = 2; 15%). None of the tumors were incidentally detected. Eight CEs were located in the right hemisphere and 5 in the left side. The 2 most common tumor locations were the frontal (n = 5; 38%) and parietal lobe (n = 5; 38%). All patients underwent surgical resection. Gross total resection was achieved in 12 patients (92%), and subtotal resection was performed in 1 patient (8%). Ten of the 11 patients who presented with seizure are seizure-free after surgery (91% seizure-free rate). According to the World Health Organization classification system, 9 tumors (69%) were Grade II (ependymoma) and 4 (31%) were Grade III (anaplastic ependymoma). The mean follow-up was 52 months (range, 20-88 months). No recurrence was observed in patients with Grade II CEs. Of 4 patients with Grade III CEs, 2 (50%) suffered from tumor recurrence after initial treatment. CONCLUSIONS: CEs are a rare subset of supratentorial ependymomas that selectively involve the cerebral cortex. Most CEs are low grade and present with seizures. Anaplastic CEs show a greater recurrence rate and a relatively poor prognosis. Gross total resection with or without adjuvant radiotherapy is currently the optimal treatment for CEs. CEs seem to have a more favorable prognosis than other supratentorial ependymomas.