Radiation doses from low-dose CT scans in SPECT/CT and PET/CT examinations: A survey in Germany.

AIM: Recently, dose reference levels (DRLs) have been defined in Germany for auxiliary low-dose CT scans in hybrid SPECT/CT and PET/CT examinations, based on data from 2016/17. Here, another survey from 2020 was evaluated and compared with the new DRLs as well as with similar surveys from foreign countries. METHODS: The survey, which had already been conducted in the Nordic countries, queried for various examinations including the following values: patient weight and height, volume CT dose index (CTDIvol), dose length product (DLP). For each examination, statistical parameters such as the third quartile (Q3) were determined from all submitted CTDIvol and DLP values. Additionally, for examinations comprising datasets from at least 10 systems, the third quartile (Q3-Med) of the respective median values of each system was calculated. Q3 and Q3-Med were compared with the newly published DRLs from Germany and values from similar studies from other countries. RESULTS: Data from 15 SPECT/CT and 13 PET/CT systems from 15 nuclear medicine departments were collected. For the following examinations datasets from more than 10 systems were submitted: SPECT lung VQ, SPECT bone, SPECT&PET cardiac, PET brain, PET oncology. Especially for examinations of the thorax and heart, the new DRLs are very strict compared to this study. The CTDIvol values for examinations of the head were lower in this study than the DRLs prescribe now. CONCLUSIONS: For certain examination types, there is a need for dose optimization at some clinics and devices in order to take into account the new DRLs in Germany in the future.

Myokardszintigraphie - eine Methode zur Erfassung der kardialen Komorbidität bei Psoriasis-Patienten?

HINTERGRUND: Kardiale Komorbiditäten bei Patienten mit Psoriasis stehen seit Jahren im Fokus. Ziel dieser Arbeit war es, im Rahmen einer Pilotstudie die Myokardszintigraphie als mögliche Früherkennungsmethode zu evaluieren. PATIENTEN UND METHODIK: Es wurden bei insgesamt 50 kardial asymptomatischen Patienten mit einer Psoriasis der Haut verschiedene Begleiterkrankungen erfasst. Dabei kam zur Erkennung von kardialem Risiko/ belastungsinduzierter Ischämie die Myokardszintigraphie zum Einsatz. ERGEBNISSE: Bei 28 Patienten (56 %) fanden sich pathologische Befunde in der Myokardszintigraphie. Davon zeigten 14 Patienten Zeichen einer sogenannten Small Vessel Disease (Kardiales Syndrom X). Darüber hinaus fanden sich weitere Begleiterkrankungen wie Adipositas, arterielle Hypertonie, Nikotinkonsum, Alkoholkonsum und erhöhte CRP-Werte. Die Häufigkeiten entsprachen im Wesentlichen den aktuellen Daten aus der Literatur. Wir konnten keinen signifikanten Zusammenhang von Schwere der Psoriasis oder der angegebenen Komorbiditäten mit einem pathologischen Befund in der Myokardszintigraphie feststellen. SCHLUSSFOLGERUNGEN: Mit der Myokardszintigraphie scheint ein sehr empfindliches, nicht invasives Früherkennungsverfahren zur Detektion kardialer Komorbidität bei Psoriasis-Patienten zur Verfügung zu stehen. Weitere größere Arbeiten mit Kontrollkollektiven und Kotrollmethoden, wie beispielsweise der Koronarangiographie, sind zur Überprüfung der Wertigkeit nötig.

Myocardial scintigraphy - a method for detecting cardiac comorbidity in psoriasis patients?

BACKGROUND: In recent years, cardiac comorbidities in psoriasis patients have increasingly moved into the focus of clinical research. The objective of the present study was to evaluate myocardial scintigraphy as a screening method in patients with psoriasis. PATIENTS AND METHODS: Assessment of various comorbidities in 50 psoriasis patients without clinical symptoms of cardiac disease. Myocardial scintigraphy was employed to detect cardiac risk/exercise-induced ischemia. RESULTS: Twenty-eight patients (56 %) had pathological findings on myocardial scintigraphy. Fourteen individuals showed evidence of small-vessel disease (cardiac syndrome X). Other comorbidities included obesity, arterial hypertension, nicotine and alcohol abuse, as well as elevated CRP levels. Frequencies largely corresponded to those reported in the recent literature. There was no significant correlation between the severity of psoriasis or any comorbidities and pathological findings on myocardial scintigraphy. CONCLUSIONS: Myocardial scintigraphy seems to be a very sensitive, noninvasive method for the early detection of cardiac comorbidities in psoriasis patients. However, determining its true diagnostic value will require larger studies with control subjects and control methods such as coronary angiography.

FDG PET/CT dataset for navigation on femoral bone: a feasibility study.

FDG PET/CT has become a valuable tool in the diagnosis of the activity of chronic osteomyelitis. The surgical strategy in the treatment of chronic osteomyelitis is the identification of the bone focus and radical debridement of sequesters. The aim of the current study was the registration and use of the FDG PET/CT imaging datasets on a navigation system to provide diagnostic imaging based feedback during surgical procedures. For the present study, FDG PET/CT scans were acquired from artificial bones and cadaver bones with a local focus of activity. The DICOM data sets were merged using a navigation system. The referenced regions of interest were matched with fluoroscopic pictures to register the PET/CT DICOM datasets to the bone and direct visual control. Navigated targeting led to accurate results when verified with fluoroscopic images by targeting previously inserted reference points in artificial and cadaver bone. FDG PET/CT datasets are suitable for navigation and compatible with conventional planning and navigation software. The combination of diagnostic FDG PET/CT imaging with surgical navigation techniques could be a valuable tool for the accurate treatment of chronic osteomyelitis.

Radiosynoviorthesis for treating recurrent joint effusions after endoprosthetic knee replacement.

PURPOSE: Radiosynoviorthesis (RSO) has been established as a treatment modality for rheumatoid arthritis. Other forms of joint diseases like recurrent joint effusions after knee arthroplasties are under investigation. The aim of this study was to examine whether RSO therapy is effective in the application of an endoprosthesis and whether there are common causes of failure. MATERIALS AND METHODS: Between 1998 and 2005, 55 patients received RSO treatment (90Y colloid) for recurrent joint effusions after endoprosthetic knee replacement. A total of 46 patients were followed up and questioned anonymously according to a modified Knee Society Knee Scoring System (KSS) and Hospital for Special Surgery score. On the basis of patient records, a subgroup analysis of patients with revision surgery after RSO (subgroup A) and without further operative interventions (subgroup B) was performed. RESULTS: Subgroup A comprised 46% (21/46) and subgroup B comprised 54% (25/46) of all patients. Most patients from subgroup A did not benefit from RSO. Of these 21 patients, 7 presented with low-grade infection, 7 presented with signs of endoprosthetic loosening, 2 presented with metal allergy, and 2 had undergone revision because of trauma.Patients in subgroup B experienced a significant improvement in pain (KSS score, from 22.5 to 34 points) and function (KSS score, from 62.9 to 77.3 points; Hospital for Special Surgery score, from 30.2 to 38.7) after RSO. CONCLUSIONS: Radiosynoviorthesis resulted in an improvement in pain and function in ∼50% of patients with knee endoprostheses. In 85% of all patients, in whom RSO treatment failed, endoprosthetic complications like infection, loosening, allergy, and trauma were detected. In conclusion, RSO is a valid therapeutic option for joint effusions after knee arthroplasties. However, if RSO fails, a thorough exclusion of endoprosthetic complications should be performed.

Carcinoma of unknown primary in the head and neck: comparison between positron emission tomography (PET) and PET/CT.

BACKGROUND: Comparison of the diagnostic validity of positron emission tomography (PET) alone with integrated PET and CT (PET/CT) in the search for occult primary tumors in patients with cancer of unknown primary (CUP) site in the head and neck. METHODS: Thirty-nine consecutive patients with clinical CUP were investigated with PET and 38 patients with PET/CT. After initial diagnostic panendoscopy and histological confirmation of the cervical lymph node metastasis, either PET or PET/CT scanning was performed. RESULTS: Integrated PET/CT had a significantly higher overall detection rate than dedicated PET alone (55.2% vs 30.8%; p = .039) and positive prediction rate (93.3% vs 46.1%; p = .01). CONCLUSION: Integrated PET/CT showed to be superior to PET in the detection of the primary site of clinically occult tumors in CUP syndrome. However, a negative result should still be investigated further by means of panendoscopy with tonsillectomy and blind biopsies.

Feasibility, toxicity, and efficacy of short induction chemotherapy of docetaxel plus cisplatin or carboplatin (TP) followed by concurrent chemoradio-therapy for organ preservation in advanced cancer of the hypopharynx, larynx, and base of tongue. Early results.

PURPOSE: Concurrent chemoradiotherapy (CRT) is standard treatment for advanced head and neck cancer. Whether short induction chemotherapy (ICT) provides additional benefit or, in particular, predictive benefit for the response to chemoradiotherapy is an open question. The present study aimed to assess the feasibility, toxicity, and efficacy of induction with docetaxel and platinum salt (TP) and subsequent CRT. PATIENTS AND METHODS: A total of 25 patients with functionally inoperable cancer of the base of the tongue, hypopharynx, or larynx received 1 cycle of docetaxel (75 mg/m², day 1) combined with either cisplatin (30 mg/m², days 1-3; n = 23) or carboplatin (AUC 1.5 days 1-3; n = 2). Responders (n = 22, >30% tumor reduction, graded by endoscopy) and 1 non-responder received CRT (target dose: 69-72 Gy) with cisplatin/paclitaxel, carboplatin/paclitaxel, or cisplatin/docetaxel. RESULTS: All patients completed ICT with acceptable toxicity (leukocytopenia grade 4: 8%). The remission rate of the primary tumor was 88% (22/25 patients). There was no need to delay CRT due to toxicity in any case. Each patient received the full radiation dose. Of the patients, 56% received >80% of the chemotherapy. The acute toxicity of CRT was moderate, no grade 4 toxicities occurred, while grade 3 toxicities included the following: infection (39%), dermatitis (13%), leukocytopenia (30%), and thrombocytopenia (4%). The local control rate was 84.6% ± 8.5% and the survival rate was 89.6% ± 7.2% at 12 months. Organ preservation was possible in 22/23 (95%) cases. CONCLUSION: Short induction with a TP regimen and subsequent CRT with a taxan is feasible and associated with an encouraging local control rate.

18Fluoroethyl-L-tyrosine-PET in long-term epilepsy associated glioneuronal tumors.

PURPOSE: Long-term epilepsy associated tumors (LEATs) are a frequent cause of drug-resistant partial epilepsy. A reliable tumor diagnosis has an important impact on therapeutic strategies and prognosis in patients with epilepsy, but often is difficult by magnetic resonance imaging (MRI) only. Herein we analyzed a large LEAT cohort investigated by 18fluoroethyl-L-tyrosine-positron emission tomography (FET-PET). METHODS: Thirty-six patients with chronic partial epilepsy and a LEAT-suspect MRI lesion were analyzed by FET-PET using visual inspection and quantitative analysis of standard uptake values (SUV). PET results were correlated with clinical and histopathologic data. RESULTS: FET-PET study was positive in 22 of 36 analyzed lesions and in 14 of 22 histologically verified LEAT lesions. The precise World Health Organization (WHO) tumoral entity was not predicted by FET-PET. Notably, FET uptake correlated strikingly with age at epilepsy onset (p = 0.001). Further correlations were seen for age at surgery (p = 0.007) and gadolinium-contrast enhancement on MRI (p < 0.05). DISCUSSION: FET-PET is a helpful tool for LEAT diagnosis, particularly when MRI readings are ambiguous. FET uptake, which is likely mediated by the l-amino acid transporter (LAT) family, might indicate a principally important biologic property of certain LEATs, since LAT molecules also are involved in cell growth regulation.

Endogenous GLP-1 regulates postprandial glycemia in humans: relative contributions of insulin, glucagon, and gastric emptying.

OBJECTIVE: Synthetic glucagon-like peptide-1 (7-36)amide (GLP-1) lowers postprandial (pp) glycemia by stimulating insulin and inhibiting glucagon release and delaying gastric emptying (GE). However, the biological effects of the endogenous peptide and their relative contributions to pp glycemia remain to be defined in detail. Using the specific GLP-1 receptor antagonist exendin(9-39)amide [Ex(9-39)], we studied the exact impact of GLP-1 after an oral meal in humans. RESEARCH DESIGN AND METHODS: After a 50-min basal period, 12 healthy subjects ingested a 412-kcal mixed semisolid meal containing 30 g oatmeal, labeled with 99mTc-Sn-colloid. GE was measured by high-resolution scintigraphy until 210 min after meal ingestion. In random order, saline or Ex(9-39) at 900 pmol/kg·min was infused iv. Additionally, in six subjects gastric motility was measured by antroduodenal manometry and a gastric barostat in parallel. RESULTS: Ex(9-39) increased pp blood glucose excursions during the first 60 min after the meal (43.9 ± 5.4 vs. 35.9 ± 3.6 mg/dl, P = 0.008; pp peak glucose 154.0 ± 5.5 vs.141.0 ± 4.7 mg/dl, P = 0.009). Insulin increased slightly with Ex(9-39), whereas the insulin to glucose ratio was unchanged. pp glucagon was significantly increased with Ex(9-39) (7.5 ± 2.4 vs. 3.2 ± 2.1 pg/ml, P = 0.024). GE and accordingly gastric motility did not change with Ex(9-39). Multiple linear regression analysis revealed only changes of pp glucagon to be significantly associated with increased pp glycemia under Ex(9-39) (R = 0.678, P = 0.015). CONCLUSIONS: Released after an oral meal, GLP-1 lowers pp glycemia. In this study, the inhibition of glucagon release was a major determinant of the acute GLP-1 action in healthy subjects. In contrast, gastric emptying was not changed by GLP-1 receptor antagonism.

[Inflammatory myofibroblastic tumor of the lymph node with paraneoplastic thrombosis and eosinophilia]. / Inflammatorischer myofibroblastärer Tumor des Lymphknotens mit paraneoplastischer Thrombose und Eosinophilie.

CASE REPORT: A 52-year-old female patient was admitted to hospital because of progressive thrombosis despite therapeutic anticoagulation as well as leukocytosis with eosinophilia and thrombocytopenia. On examination, the patient presented with dyspnea and swelling oft her left leg and arm. The laboratory findings revealed leukocytosis (31,000/microl) with eosinophilia (54%), thrombocytopenia (58,000/microl), together with an increased C-reactive protein of 247 mg/dl (reference range < 5 mg/dl). Initial computed tomography scans showed pulmonary embolism and a slightly enlarged left inguinal lymph node. Histological examination of the lymph node biopsy revealed in part an epitheloid and spindle cell-like tumorous lesion with slightly increased tissue eosinophilia consistent with an inflammatory myofibroblastic tumor (IMT). Resection of the left inguinal lymph node resulted in an immediate regression of the paraneoplastic eosinophilia and thrombocytopenia. Anti-inflammatory medication with ibuprofen was subsequently initiated. Imaging and clinical examination at 3 months after discharge revealed no relapse and no signs of a paraneoplastic syndrome. CONCLUSION: The IMT is a rare soft-tissue tumor of intermediate dignity with a low tendency to metastasize. It is consistently accompanied by paraneoplastic syndromes. Therapy of choice is complete resection of the tumor. In nonresectable cases, corticosteroids and nonsteroidal antirheumatics have been shown to be effective. Because of the variable clinical course ranging from spontaneous regression to metastasis, IMTs might be separated into different entities (autoimmune, inflammatory, neoplastic subtype) which thus far cannot be classified on a histopathologic basis. A clinical assessment of the dignity is therefore important until further subclassifications of this rare disease become available.

Regional lymph node involvement in T1 papillary thyroid carcinoma: a bicentric prospective SPECT/CT study.

PURPOSE: Hybrid imaging combining single photon emission computed tomography (SPECT) with (131)I and X-ray computed tomography (CT) performed at radioablation (RA) for thyroid carcinoma more accurately detects regional lymph node metastases (LNM) than does planar imaging. In this bicentric prospective study we used hybrid imaging in conjunction with histopathological examination to measure LNM frequency in a consecutive group of patients referred for RA due to stage T1 papillary thyroid carcinoma (PTC). METHODS: At the Departments of Nuclear Medicine of the Ludwig Maximilian University of Munich and the Friedrich Alexander University of Erlangen-Nuremberg SPECT/spiral CT is routinely performed in all PTC subjects at the time of RA. Screening of our SPECT/CT databases for PTC patients with T1 histology produced 98 patients from Munich and 53 patients from Erlangen, including 96 of 151 patients with microcarcinoma. In 69 patients of the entire group, cervical lymph node dissection had been performed, whereas nodal staging in the remaining 82 subjects was based on SPECT/CT. RESULTS: LNM incidence in the whole group was 26% [95% confidence interval (CI): 20-33%] versus 22% (95% CI: 15-31%) in the microcarcinoma subgroup. SPECT/CT was more accurate in 24.5% of our patients than planar imaging with regard to nodal staging. CONCLUSION: LNM occurs in one quarter of all patients with T1 PTC, and also in the subset with microcarcinoma. Performing (131)I SPECT/CT, either with therapeutic or diagnostic radioactivities, directly after thyroidectomy should provide more accurate staging of T1 PTC, thus facilitating optimal therapeutic management.

Skeletal SPECT/CT of the peripheral extremities.

OBJECTIVE: Hybrid cameras that combine SPECT and helical CT can be used to correlate scintigraphic information with morphologic information in one imaging session. The purpose of this study was to investigate, in comparison with the value of scintigraphy and SPECT alone, the incremental diagnostic value of skeletal SPECT/CT in the care of patients with pain of the extremities. MATERIALS AND METHODS: Seventy-one patients without cancer who had pain in the extremities underwent three-phase bone scintigraphy and SPECT/CT of either the upper (n = 20) or the lower (n = 51) extremities. Planar scintigraphic and SPECT images and planar scintigraphic and SPECT/CT images were interpreted independently from each other. The findings were classified into the following diagnostic categories: normal, trauma, tumor, osteomyelitis, and osteoarthritis. RESULTS: Four patients had no abnormal bone metabolism or CT abnormality in the extremities. Among 34 lesions classified as osteoarthritis on planar and SPECT images, seven were reclassified as fracture and one as benign tumor at SPECT/CT. Of 15 lesions initially classified as osteomyelitis, four were diagnosed as osteoarthritis, four as fracture, and one as inflammation of the soft tissue only. Of eight diagnoses of fracture with the conventional approach, two were reclassified as osteomyelitis and two as osteoarthritis. In one of 10 patients with the initial diagnosis of a tumorlike lesion, the diagnosis was changed to trauma on the basis of SPECT/CT findings, and in another patient, the diagnosis was changed to osteoarthritis. Overall, SPECT/CT findings led to revision of the diagnostic category in the cases of 23 of 71 patients (p < 0.01). CONCLUSION: Compared with bone scintigraphy and SPECT, the use of SPECT/CT increases diagnostic accuracy in the evaluation of orthopedic disorders affecting the extremities.

Five months' follow-up of patients with and without iodine-positive lymph node metastases of thyroid carcinoma as disclosed by (131)I-SPECT/CT at the first radioablation.

PURPOSE: In differentiated thyroid carcinoma (DTC), (131)I-SPECT/CT is more accurate in identifying radioiodine-positive lymph node metastases (LNM) than planar whole-body scans (WBS). The purpose of this study was to investigate the value of (131)I-SPECT/CT performed at the first radioablation to predict the occurrence and/or persistence of cervical radioiodine-positive LNM 5 months later. METHODS: The study included 81 DTC patients that had had SPECT/ spiral CT after radioablation of thyroid remnants after thyroidectomy. The patients were re-examined 5 months later using (131)I-WBS performed at TSH stimulation. In addition, SPECT/CT of the neck was performed in patients with iodine-positive cervical foci to distinguish between thyroid remnant and LNM. The outcome variable of the study was the detection or exclusion of iodine-positive cervical LNM. RESULTS: Of 61 patients without a SPECT/CT diagnosis of (131)I-positive LNM at radioablation, 60 had no (131)I-positive LNM at follow-up. In the remaining patient of this group, a new radioiodine-positive LNM was detected. In 17 of 20 patients with a SPECT/CT diagnosis of (131)I-positive LNM (n = 19) or an indeterminate lesion (n = 1) at first radioablation, no (131)I-positive LNM were detected 5 months later. Radioiodine-positive LNM persisted in three patients of this group. CONCLUSION: (131)I-SPECT/CT has a high negative predictive value with regard to the occurrence of radioiodine-positive cervical LNM 5 months after initial therapy. The majority of iodine-positive LNM diagnosed by SPECT/CT at radioablation disappear within 5 months. These findings motivate further research into the value of (131)I-SPECT/CT of the neck for predicting recurrence and planning surgical reintervention in DTC.

Use of 18F-FDG-PET in the diagnosis of endoprosthetic loosening of knee and hip implants.

INTRODUCTION: To diagnose septic and aseptic loosening 18-fluorodeoxyglucose positron emission tomography ((18)F-FDG-PET) has been described with good results for hip arthroplasties. The purpose of the present study was to examine whether there is a difference of feasibility in detecting loosening of hip versus knee prostheses by use of (18)F-FDG-PET. PATIENTS: Thirty-two patients with lower limb arthroplasty complaints (74 components) were studied preoperatively with (18)F-FDG-PET. The interpretation of (18)F-FDG-PET was done according to evaluated criteria. The final diagnosis based on intraoperative findings in all cases including microbiological examinations. RESULTS: For hip arthroplasty sensitivity/specificity of (18)F-FDG-PET towards implant loosening was 80%/87%. For infectious loosening of hip endoprostheses sensitivity/specificity was 67%/83%. In knee endoprostheses sensitivity/specificity for loosening was 56%/82% and 14%/89% for infection. The sensitivity of the results for knee and hip joints in regard to infectious versus aseptic loosening was significantly different. CONCLUSION: We confirm that (18)F-FDG-PET is an appropriate tool to diagnose hip arthroplasty loosening. Differing from that (18)F-FDG-PET showed a significant lower sensitivity/specificity in detecting septic loosening of knee endoprostheses. It may therefore be necessary to use different methods to diagnose loosening of endoprostheses depending on the type of implant which is examined.

Managing non-paraneoplastic Lambert-Eaton myasthenic syndrome: clinical characteristics in 25 German patients.

In about 40% of patients LEMS is not a paraneoplastic phenomenon (NT-LEMS). Several clinical aspects important to these patients remain open, especially the question when a LEMS can definitely be diagnosed as NT-LEMS. Here we describe a series of 25 German NT-LEMS patients regarding their clinical characteristics, duration of symptoms, value of serological markers, paraneoplastic antibodies and FDG-PET/CT. Furthermore, we discuss the current diagnostic criteria of NT-LEMS.

Osteocutaneous free flap including medial and lateral scapular crests: technical aspects, viability, and donor site morbidity.

The aims of the present study were to check for metabolism of the bony segments of osteocutaneous free flaps that included lateral as well as medial scapular crests by 18F-fluoride positron emission tomography (PET)/computed tomography (CT) examinations and to assess donor site morbidity. Twenty patients were included in the study. In 10 patients, osteocutaneous free flaps were harvested that included lateral as well as medial scapular crests. Seven days after surgery, an 18F-fluoride PET/CT examination was performed to assess the metabolism and viability of the bony segments. In the additional 10 patients, flaps were harvested that only included the lateral scapular crest. All patients were asked to fill in the disabilities of the arm, shoulder, and hand (DASH) questionnaire 1 and 6 months after surgery. In the 10 free flaps that included lateral as well as medial scapular crests, 18F-fluoride PET/CT examinations revealed metabolism and viability of both bony segments. The DASH scores for the two patient groups did not differ significantly at 1 and 6 months after surgery (p(1 month) = 0.520, p(6 months) = 0.545). It seems that scapular osteocutaneous free flaps adopting lateral as well as medial scapular crests are a viable option for mandibular reconstruction and may be an alternative to the fibular double barrel.

Diabetes mellitus and gastric emptying: questions and issues in clinical practice.

It is long known that both type 1 and type 2 diabetes can be associated with changes in gastric emptying; a number of publications have linked diabetes to delayed gastric emptying of variable severity and often with poor relationship to gastrointestinal symptomatology. In contrast, more recent studies have reported accelerated gastric emptying when adjusted for glucose concentration in patients with diabetes, indicating a reciprocal relationship between gastric emptying and ambient glucose concentrations. This review proposes that gastroparesis or gastroparesis diabeticorum, a severe condition characterized by a significant impairment of gastric emptying accompanied by severe nausea, vomiting, and malnutrition, is often overdiagnosed and not well contrasted with delays in gastric emptying. The article offers a clinically relevant definition of gastroparesis that should help differentiate this rare condition from (often asymptomatic) delays in gastric emptying. The fact that delayed gastric emptying can also be observed in non-diabetic individuals under experimental conditions in which hyperglycaemia is artificially induced suggests that a delay in gastric emptying rate when blood glucose concentrations are high is actually an appropriate physiological response to hyperglycaemia, slowing further increases in blood glucose. The article discusses the strengths and weaknesses of various methodologies for assessing gastric emptying, especially with respect to the diabetes population, and reviews newer diabetes therapies that decelerate the rate of gastric emptying. These therapies may be a beneficial tool in managing postprandial hyperglycaemia because they attenuate rapid surges in glucose concentrations by slowing the delivery of meal-derived glucose.

Detection of tumour invasion into the pyramidal tract in glioma patients with sensorimotor deficits by correlation of (18)F-fluoroethyl-L: -tyrosine PET and magnetic resonance diffusion tensor imaging.

PURPOSE: Standard magnetic resonance imaging (MRI) does not depict the true extent of tumour cell invasion in gliomas. We investigated the feasibility of advanced imaging methods, i.e. diffusion tensor imaging (DTI), fibre tracking and O-(2-[(18)F]-fluoroethyl)-L: -tyrosine ((18)F-FET) PET, for the detection of tumour invasion into white matter structures not visible in routine MRI. METHODS: DTI and fibre tracking was performed on ten patients with gliomas, WHO grades II-IV. Five patients experienced preoperative sensorimotor deficits. The ratio of fractional anisotropy (FA) between the ipsilateral and contralateral pyramidal tract was calculated. Twenty-one stereotactic biopsies from five patients were histopathologically evaluated for the absolute numbers and percentages of tumour cells. (18)F-FET PET scans were performed and the bilateral ratio [ipsilateral-to-contralateral ratio (ICR)] of (18)F-FET-uptake was calculated for both cross-sections of pyramidal tracts and biopsy sites. RESULTS: The FA ratio within the pyramidal tract was lower in patients with sensorimotor deficits (0.61-1.06) compared with the FA ratio in patients without sensorimotor deficits (0.92-1.06). In patients with preoperative sensorimotor deficits, we found a significantly (p = 0.028) higher ICR of (18)F-FET uptake (1.01-1.59) than in patients without any deficits (0.96-1.08). The ICR of (18)F-FET-uptake showed a strong correlation (r = 0.696, p = 0.001) with the absolute number of tumour cells and a moderate correlation (r = 0.535, p = 0.012) with the percentage of tumour cells. CONCLUSIONS: Our data show an association between preoperative sensorimotor deficits, increased (18)F-FET uptake and decreased FA ratio in the pyramidal tract. We demonstrated a correlation between tumour invasion and (18)F-FET uptake. These findings may help to distinguish between edema versus tumour-associated neurological deficits and could prevent the destruction of important structures, like the pyramidal tract, during tumour operations by allowing more precise preoperative planning.

Long term survival in anti-Hu associated adult neuroblastoma.

We report on a young lady suffering from adult neuroblastoma and anti-Hu associated paraneoplastic encephalomyelitis (PEM) with a tumour free survival of nine years up to now. Treatment included tumour surgery, radiation, high dose chemotherapy, and stem cell transplantation. Serological testing demonstrated a marked decline in anti-Hu antibody titres under therapy, and subsequent disappearance of the antibody 31 months after second tumour resection.