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1.
J Ultrasound ; 2024 Jun 16.
Article in English | MEDLINE | ID: mdl-38879834

ABSTRACT

The Testicular Juvenile Granulosa Cell Tumor (JGCT) is a rare testicular neoplasm that appears in the first months of life as a painless testicular mass. Following an accurate radiological ultrasound diagnosis, through which the cystic appearance of the lesion is observed, and histological confirmation, showing follicular growth pattern and an immunoreactivity for inhibin, the treatment process involves, when feasible, conservative surgery. We present the case of a 2-months old infant with a bilateral JGCT of the testis and we review the classical findings of the patology.

2.
Case Rep Womens Health ; 41: e00580, 2024 Mar.
Article in English | MEDLINE | ID: mdl-38282900

ABSTRACT

DICER1 syndrome is a rare genetic disorder predisposing young patients to multiple types of cancer. A 17-year-old woman with a history of mixed Sertoli-Leydig cell tumor and juvenile granulosa cell tumor of the left ovary at age 14 presented with a pelvic mass. She underwent fertility preservation cytoreductive surgery and the pathology showed high-grade sarcoma with rhabdomyosarcomatous differentiation. After the surgery, patient received one cycle of chemotherapy but her disease continued to progress. She therefore underwent total hysterectomy, right salpingo-oophorectomy and hyperthermic intraperitoneal chemotherapy followed by consolidation chemotherapy. Magnetic resonance imaging revealed no evidence of the disease before and after the completion of her chemotherapy. Genetic testing confirmed the DICER1 pathogenic variant. However, she presented again with a recurrence of the disease 6 months later and ultimately died of the disease 11 months after the surgery. Our case demonstrates the challenging management of this rare disease in a young patient and the need for new and effective treatments.

3.
Gynecol Oncol Rep ; 49: 101287, 2023 Oct.
Article in English | MEDLINE | ID: mdl-37840846

ABSTRACT

•Multiple case reports are published on patients with Ollier's disease presenting simultaneously with granulosa cell tumors.•More medical conditions are being treated with androgens and estrogens, including gender dysphoria.•Caution should be given to transgender patients on active hormonal therapy.•Providers should consider prescreening for hormonally responsive medical conditions.

4.
Diagn Cytopathol ; 51(12): E342-E344, 2023 Dec.
Article in English | MEDLINE | ID: mdl-37650316

ABSTRACT

Juvenile granulosa cell tumor (JGCT) is an uncommon ovarian tumor. There are only a few cases in the literature that depict the cytomorphology of JGCT at the primary/metastatic site. We described the fine-needle aspiration cytology of a recurrent metastatic JGCT of the anterior abdominal wall, 5 years post-surgery (total abdominal hysterectomy with bilateral salpingo-oophorectomy).


Subject(s)
Abdominal Wall , Granulosa Cell Tumor , Ovarian Neoplasms , Female , Humans , Granulosa Cell Tumor/surgery , Abdominal Wall/pathology , Ovarian Neoplasms/pathology , Hysterectomy , Biopsy, Fine-Needle
5.
Clin Lab Med ; 43(2): 245-274, 2023 06.
Article in English | MEDLINE | ID: mdl-37169445

ABSTRACT

This article focuses on the recent advances in ovarian sex cord-stromal tumors, predominantly in the setting of their molecular underpinnings. The integration of genetic information with morphologic and immunohistochemical findings in this rare subset of tumors is of clinical significance from refining the diagnostic and prognostic stratifications to genetic counseling.


Subject(s)
Ovarian Neoplasms , Sex Cord-Gonadal Stromal Tumors , Female , Humans , DEAD-box RNA Helicases/genetics , Ribonuclease III/genetics , Sex Cord-Gonadal Stromal Tumors/diagnosis , Sex Cord-Gonadal Stromal Tumors/genetics , Sex Cord-Gonadal Stromal Tumors/pathology , Ovarian Neoplasms/diagnosis , Ovarian Neoplasms/genetics , Ovarian Neoplasms/pathology , Prognosis
6.
Gynecol Oncol Rep ; 46: 101164, 2023 Apr.
Article in English | MEDLINE | ID: mdl-36992983

ABSTRACT

Objective: To report a case of stage IIIB juvenile granulosa cell tumor (JGCT) complicating pregnancy in a 33 year-old (y.o.) woman. Methods: Retrospective review of the clinical data, imaging studies, and pathology reports of a case of JGCT diagnosed during pregnancy. Patient consent was obtained for review and presentation of the case. A literature review was conducted. Results: A 33 y.o., gravida 3, para 1 was incidentally found to have an 8 cm left ovarian mass on an anatomy scan at 22 weeks gestation. Four days later, she presented to labor and delivery triage with abdominal pain. An ultrasound revealed an 11 cm heterogeneous, solid mass in the left adnexa and free fluid at this level. The diagnosis of degenerating fibroid was made based on her clinical presentation and she was discharged. A follow up outpatient MRI revealed a 15 cm left ovarian mass consistent with a primary malignant ovarian neoplasm with moderate ascites and omental, left cul de sac, and probable paracolic gutter implantation. She re-presented 2 weeks later with an acute abdomen and was admitted for a gynecologic oncology consult. Pre-op tumor markers showed an elevated inhibin B. She underwent an exploratory laparotomy, left salpingo-oophorectomy, omental biopsy, and small bowel resection at 25 weeks gestation. Intra-op findings included a ruptured tumor and metastases. Tumor reductive surgery was completed to R0. Pathology revealed a JGCT, FIGO stage IIIB. The pathology and management were reviewed in collaboration with an outside institution. Chemotherapy was delayed until after delivery with monthly MRI surveillance. She underwent induction of labor at 37 weeks followed by an uncomplicated vaginal delivery. She received 3 cycles of bleomycin, etoposide, and cisplatin starting six weeks postpartum. Last known contact was over five years after the initial diagnosis with no evidence of recurrent disease. Conclusion: JGCTs account for 5% of granulosa cell tumors and 3% are diagnosed after age 30. JGCT is an uncommon neoplasm in pregnancy. 90% are stage I at diagnosis, but advanced stage tumors are aggressive often resulting in recurrence or death within 3 years of diagnosis. We present a surgically treated case with delay in chemotherapy until after delivery with a good outcome after 5 years of follow up.

7.
Mod Pathol ; 36(6): 100142, 2023 06.
Article in English | MEDLINE | ID: mdl-36813116

ABSTRACT

Testicular juvenile granulosa cell tumors (JGCTs) are a rare type of sex cord-stromal tumor, accounting for <5% of all neoplasms of the prepubertal testis. Previous reports have demonstrated sex chromosome anomalies in a small subset of cases, but the molecular alterations associated with JGCTs remain largely undescribed. We evaluated 18 JGCTs using massive parallel DNA and RNA sequencing panels. The median patient age was <1 month (range, newborn to 5 months). The patients presented with scrotal or intra-abdominal masses/enlargement, and all underwent radical orchiectomy (17 unilateral and 1 bilateral). The median tumor size was 1.8 cm (range, 1.3-10.5 cm). Histologically, the tumors were purely cystic/follicular or mixed (ie, solid and cystic/follicular). All cases were predominantly epithelioid, with 2 exhibiting prominent spindle cell components. Nuclear atypia was mild or absent, and the median number of mitoses was 0.4/mm2 (range, 0-10/mm2). Tumors frequently expressed SF-1 (11/12 cases, 92%), inhibin (6/7 cases, 86%), calretinin (3/4 cases, 75%), and keratins (2/4 cases, 50%). Single-nucleotide variant analysis demonstrated the absence of recurrent mutations. RNA sequencing did not detect gene fusions in 3 cases that were sequenced successfully. Recurrent monosomy 10 was identified in 8 of 14 cases (57%) with interpretable copy number variant data, and multiple whole-chromosome gains were present in the 2 cases with significant spindle cell components. This study demonstrated that testicular JGCTs harbor recurrent loss of chromosome 10 and lack the GNAS and AKT1 variants described in their ovarian counterparts.


Subject(s)
Granulosa Cell Tumor , Ovarian Neoplasms , Sex Cord-Gonadal Stromal Tumors , Testicular Neoplasms , Male , Infant, Newborn , Female , Humans , Infant , Granulosa Cell Tumor/genetics , Chromosomes, Human, Pair 10 , Testicular Neoplasms/genetics , Testicular Neoplasms/pathology , Ovarian Neoplasms/pathology , Sex Cord-Gonadal Stromal Tumors/genetics , Sex Cord-Gonadal Stromal Tumors/pathology
8.
Skeletal Radiol ; 52(3): 605-612, 2023 Mar.
Article in English | MEDLINE | ID: mdl-35296906

ABSTRACT

Prior case reports have described synchronous ovarian juvenile granulosa cell tumor (JGCT) and enchondromatosis in patients with Ollier disease and Maffucci syndrome. We present a case of a juvenile granulosa cell tumor with an IDH1 somatic mutation identified in the ovarian tissue in a 15-year-old female who presented with abnormal vaginal bleeding, several months of irregular menses, and a large multicystic adnexal mass. Multiple mixed lytic and sclerotic lesions were identified in the bones of the pelvis on imaging studies obtained during the work-up of her abdominal mass. Like previous reports in patients with undiagnosed enchondromatosis, these lesions were presumed to represent skeletal metastases; however, biopsy tissue revealed a hyaline cartilage neoplasm. Subspecialty review of the imaging findings revealed imaging features classic for Ollier disease involving the flat bones of the pelvis. It is important for radiologists to be familiar with the association between enchondromatosis and JGCT. When a female patient with enchondromatosis presents with a large, unilateral, mixed solid-cystic ovarian mass, the diagnosis of JGCT can be suggested. Alternatively, when a patient is diagnosed with JGCT, any skeletal lesions should be scrutinized for imaging features that suggest a hyaline cartilage neoplasm to avoid the misdiagnosis of skeletal metastases in a patient with previously undiagnosed Ollier disease or Maffucci syndrome. To our knowledge, this is the second reported confirmed case of an IDH1 somatic mutation identified in the ovarian tissue of a JGCT in a patient with Ollier disease.


Subject(s)
Bone Neoplasms , Enchondromatosis , Granulosa Cell Tumor , Neoplasms, Connective Tissue , Humans , Female , Adolescent , Granulosa Cell Tumor/complications , Enchondromatosis/diagnostic imaging , Enchondromatosis/complications , Bone Neoplasms/diagnostic imaging , Bone Neoplasms/complications , Bone and Bones/pathology
10.
Am J Transl Res ; 14(9): 6823-6827, 2022.
Article in English | MEDLINE | ID: mdl-36247268

ABSTRACT

This report describes a 17-year-old patient with ovarian granulosa cell tumor torsion, which is rare. The patient presented with lower abdominal pain for 1 day after defecation, accompanied by nausea and vomiting. Gynecological examination revealed a palpable mass of about 150 mm × 130 mm in the uterus. The mass had high surface tension, tight cysts, well-defined borders, and marked tenderness at its pedicle. Gynecological B-ultrasonography showed that the uterus was not compressed, and a mixed echo of about 152 mm × 112 mm was seen in the pelvic cavity. The initial diagnosis was ovarian tumor torsion. After explaining the condition to the patient's family, an emergent open resection of left ovarian tumor was performed. The postoperative pathology report indicated juvenile granulosa cell tumor. The patient's body temperature was normal, and there was no infection or thrombosis after operation.

11.
Article in English | MEDLINE | ID: mdl-36112066

ABSTRACT

Predominantly androgen secreting juvenile granulosa cell tumors (JGCT) are uncommon and few reports exist in the literature. We present a case of a JGCT which presented with signs of prepubertal hyperandrogenism and insulin resistance to highlight the possible interaction between hyperandrogenemia and hyperinsulinism. We conducted chart review of a rare androgen secreting JGCT accompanied by hyperinsulinemia in a prepubertal patient. A 4-year-old girl presented with acanthosis nigricans and hyperinsulinism mimicking the Hyperandrogenism Insulin Resistance and Acanthosis Nigricans (HAIR-AN) syndrome at an age much younger than is typical for this diagnosis. Laboratory studies revealed elevated insulin, inhibin A and B, and total testosterone. All laboratory results normalized after unilateral salpingo-oophorectomy. The final diagnosis was Stage IA JGCT. This case highlights the importance of including ovarian tumors in the differential diagnosis when considering causes of virilization and insulin resistance. Our case illustrates the potential relationship between excess testosterone secretion and hyperinsulinemia and strengthens evidence that hyperandrogenemia may promote hyperinsulinism in ovarian disease.

12.
Surg Pathol Clin ; 15(2): 235-258, 2022 Jun.
Article in English | MEDLINE | ID: mdl-35715160

ABSTRACT

This article focuses on the recent advances in ovarian sex cord-stromal tumors, predominantly in the setting of their molecular underpinnings. The integration of genetic information with morphologic and immunohistochemical findings in this rare subset of tumors is of clinical significance from refining the diagnostic and prognostic stratifications to genetic counseling.


Subject(s)
Ovarian Neoplasms , Sex Cord-Gonadal Stromal Tumors , DEAD-box RNA Helicases/genetics , Female , Humans , Ovarian Neoplasms/diagnosis , Ovarian Neoplasms/genetics , Ovarian Neoplasms/pathology , Prognosis , Ribonuclease III/genetics , Sex Cord-Gonadal Stromal Tumors/diagnosis , Sex Cord-Gonadal Stromal Tumors/genetics , Sex Cord-Gonadal Stromal Tumors/pathology
13.
Gynecol Oncol Rep ; 40: 100956, 2022 Apr.
Article in English | MEDLINE | ID: mdl-35300053

ABSTRACT

Background: The main pediatric (0-18 years) gynecologic cancers include stromal carcinomas (juvenile granulosa cell tumors and Sertoli-Leydig cell tumors), genital rhabdomyosarcomas and ovarian germ cell. Outcomes depend on time of diagnosis, stage, tumor type and treatment which can have long-term effects on the reproductive career of these patients. This study seeks to analyze the trends in clinical-pathologic presentation, treatment and outcomes in the cases seen at our facility. This is the first paper identifying these cancers published from sub-Saharan Africa. Method: Retrospective review of clinico-pathologic profiles and treatment outcomes of pediatric gynecologic oncology patients managed at MTRH between 2010 and 2020. Data was abstracted from gynecologic oncology database and medical charts. Results: Records of 40 patients were analyzed. Most, (92.5%, 37/40) of the patients were between 10 and 18 years. Ovarian germ cell tumors were the leading histological diagnosis in 72.5% (29/40) of the patients; with dysgerminomas being the commonest subtype seen in 12 of the 37 patients (32.4%). The patients received platinum-based chemotherapy in 70% of cases (28/40). There were 14 deaths among the 40 patients (35%). Conclusion: Surgery remains the main stay of treatment and fertility-sparing surgery with or without adjuvant platinum-based chemotherapy are the standard of care with excellent prognosis following early detection and treatment initiation. LMICs face several challenges in access to quality care and that affects survival of these patients. Due to its commonality, ovarian germ cell cancers warrant a high index of suspicion amongst primary care providers attending to adnexal masses in this age group.

14.
J Adolesc Young Adult Oncol ; 11(6): 621-631, 2022 12.
Article in English | MEDLINE | ID: mdl-35049372

ABSTRACT

Juvenile granulosa cell tumor (JGCT) of the ovary is an uncommon malignancy, with most cases seen in adolescent girls and young women. The majority of these patients present with unilateral ovarian disease, and to date, bilateral JGCTs have been reported in 10 cases. Although the histopathologic features have been detailed in the published literature, extensive extracellular mucin deposition has been documented in only one case. Herein, we report a 17-year-old adolescent girl with bilateral solid-cystic adnexal masses diagnosed as bilateral JGCT with abundant extracellular mucin deposition on histopathology. The index case highlights a rare clinical and histopathologic presentation of JGCT. Adequate knowledge of such unusual presentations is essential for accurate distinction from other ovarian tumors and appropriate management.


Subject(s)
Granulosa Cell Tumor , Mucins , Humans , Adolescent , Female , Granulosa Cell Tumor/diagnosis
15.
Cancer Cytopathol ; 130(1): 55-71, 2022 01.
Article in English | MEDLINE | ID: mdl-34411449

ABSTRACT

BACKGROUND: Gynecologic sex cord-stromal tumors (SCSTs) arise from sex cords of the embryonic gonad and may display malignant behavior. We describe the cytomorphologic features of SCSTs in females, including adult and juvenile granulosa cell tumors (AGCTs and JGCTs), Sertoli-Leydig cell tumors (SLCTs), and steroid cell tumors (SCTs). METHODS: We retrieved available cytology slides from females with a histologic diagnosis of sex cord-stromal tumor between 2009 and 2020 from institutional archives and reviewed their cytoarchitectural features. RESULTS: There were 25, 2, 2, and 1 cytology specimens from 19, 2, 2, and 1 patients (aged 7-90 years, median 57 years) with AGCT, JGCT, SLCT, and SCT, respectively. Features common to all SCSTs included 3-dimensional groups, rosettes, rare papillary fragments, abundant single cells and naked nuclei. Rosettes and a streaming appearance of cell groups were only seen in AGCTs, which also rarely featured eosinophilic hyaline globules and metachromatic stroma. AGCTs exhibited high nuclear:cytoplasmic (N:C) ratios, with mild nuclear pleomorphism, uniform nuclei with finely granular chromatin, nuclear grooves and small nucleoli; in contrast, other SCSTs lacked rosettes and nuclear grooves and had generally lower N:C ratios, greater nuclear pleomorphism, coarse chromatin and more abundant cytoplasm. Mitotic figures, necrosis, and inflammation were rarely identified. CONCLUSIONS: AGCTs show cytomorphologic features that are distinct from those of other SCSTs. Careful evaluation of the cytological features and ancillary studies (eg, immunochemistry for FOXL2, inhibin and calretinin, or sequencing for FOXL2 mutations) can aid in the accurate diagnosis of these tumors.


Subject(s)
Granulosa Cell Tumor , Ovarian Neoplasms , Sex Cord-Gonadal Stromal Tumors , Adult , Chromatin , Female , Granulosa Cell Tumor/diagnosis , Granulosa Cell Tumor/genetics , Granulosa Cell Tumor/pathology , Humans , Mutation , Ovarian Neoplasms/pathology , Sex Cord-Gonadal Stromal Tumors/diagnosis , Sex Cord-Gonadal Stromal Tumors/genetics , Sex Cord-Gonadal Stromal Tumors/pathology
16.
J Pediatr Adolesc Gynecol ; 35(4): 486-491, 2022 Aug.
Article in English | MEDLINE | ID: mdl-34902562

ABSTRACT

STUDY OBJECTIVE: The objective of the study was to analyze the oncological outcomes and prognostic factors in patients with early-stage juvenile granulosa cell tumor (JGCT) who underwent fertility-sparing surgery. DESIGN, SETTING, AND PARTICIPANTS: All patients with early-stage JGCT who underwent fertility-sparing surgery between January 1995 and December 2017 were reviewed retrospectively. INTERVENTIONS: None. MAIN OUTCOME MEASURES: The risk factors for recurrence and death in patients with early-stage JGCT were identified. RESULTS: Thirty-five patients were eligible for the current study. The median age was 17 years (range: 4-30 years), and 10 patients were premenarchal. Nine patients were International Federation of Obstetrics and Gynecology stage IA, and 26 were stage IC. Eight subjects underwent complete staging, whereas 28 had no staging at their initial surgery. In those without initial staging, 3 patients who received initial unilateral salpingo-oophorectomy (USO) and 6 with initial cystectomy underwent secondary surgery for staging or USO with staging, respectively. At the time of the secondary staging operation, 1 of the subjects (treated with USO at initial surgery) was found to be stage III and was excluded from this study. Therefore, 8 patients underwent secondary staging surgery performed by laparoscopic surgery, and none of them suffered recurrence during follow-up. Fourteen of the 16 patients with complete staging surgery underwent lymphadenectomy, and none of them had lymph node metastasis. Thirty-one patients received adjuvant chemotherapy after surgery. Eight patients had disease recurrence after a median follow-up time of 51 months (range: 6-229 months), with a median time to recurrence of 4.5 months (range: 2-52 months). Six patients died of their disease. The 5-year disease-free and overall survival rates were 74.8% and 84.3%, respectively. Univariate analysis showed that incomplete staging surgery was associated with increased risk of recurrence (P = 0.029). Adjuvant chemotherapy was not associated with disease-free survival. Four patients had a total of 6 pregnancies, resulting in 6 live births. CONCLUSION: Complete surgical staging is recommended for early-stage JGCT, but lymph node dissection can be omitted. Laparoscopic restaging surgery is feasible for patients with incomplete staging at initial surgery. However, the prognosis of patients with relapsed JGCT remains poor.


Subject(s)
Granulosa Cell Tumor , Ovarian Neoplasms , Adolescent , Female , Granulosa Cell Tumor/pathology , Granulosa Cell Tumor/surgery , Humans , Neoplasm Recurrence, Local/pathology , Neoplasm Staging , Ovarian Neoplasms/pathology , Pregnancy , Prognosis , Retrospective Studies
17.
Arch Gynecol Obstet ; 305(5): 1299-1310, 2022 05.
Article in English | MEDLINE | ID: mdl-34694430

ABSTRACT

BACKGROUND: Pregnancy complicated with juvenile granulosa cell tumor (JGCT) is very rare; thus, the experience on clinical diagnosis and management is limited. CASES: Two patients presented with abdominal pain, two were incidentally discovered, one by ultrasonography, and one during a caesarian section. One case received an emergency caesarian section because of tumor rupture at 38th week's gestation, the rest were treated at full term and no abnormalities were detected in the newborns. Three cases received further staging surgery, two of which received postoperative adjuvant chemotherapy. No patient had recurrent disease after a follow-up period spanning from 13 to 57 months. CONCLUSION: In the absence of emergency, surgery can be delayed without affecting the fetus. More research is needed to determine the value of chemotherapy in FIGO stage I patients.


Subject(s)
Granulosa Cell Tumor , Ovarian Neoplasms , Chemotherapy, Adjuvant , Female , Granulosa Cell Tumor/diagnostic imaging , Granulosa Cell Tumor/surgery , Humans , Infant, Newborn , Neoplasm Staging , Ovarian Neoplasms/diagnostic imaging , Ovarian Neoplasms/surgery , Pregnancy , Ultrasonography
18.
Tumori ; 107(6): NP141-NP143, 2021 Dec.
Article in English | MEDLINE | ID: mdl-34674583

ABSTRACT

BACKGROUND: The lack of internationally recognized guidelines for very rare tumors, such as juvenile granulosa cell tumors (JGCTs), which are nonepithelial, unusual ovarian tumors, is a challenge for pediatric oncologists, especially in developing countries with limited resources and experience in treating rare tumors. METHODS: We report clinical data of 2 girls with JGCTs treated at the Pediatric Cancer and Blood Disorders Center of Armenia with the assistance of the EXPeRT (European Cooperative Study Group for Pediatric Rare Tumors) international cooperation panel. CASE PRESENTATION: Two girls (16 and 15 years old) with JGCTs of the ovaries, stage Ic, underwent surgery and, with consultation through an online advisory board (http://vrt.cineca.it/), received 4 cycles of chemotherapy according to the PEI regimen (cisplatin, etoposide, ifosfamide). CONCLUSION: Very rare tumors, especially in advanced stages, have limited data and a low survival rate. International collaboration with the EXPeRT group is beneficial for physicians with limited experience and facilitates research in pediatric oncology.


Subject(s)
Expert Testimony , Granulosa Cell Tumor/therapy , Ovarian Neoplasms/therapy , Referral and Consultation , User-Computer Interface , Adolescent , Age Factors , Clinical Decision-Making , Disease Management , Disease Susceptibility , Female , Granulosa Cell Tumor/diagnosis , Granulosa Cell Tumor/etiology , Humans , Outcome Assessment, Health Care , Ovarian Neoplasms/diagnosis , Ovarian Neoplasms/etiology
19.
Radiol Case Rep ; 16(9): 2609-2613, 2021 Sep.
Article in English | MEDLINE | ID: mdl-34285730

ABSTRACT

Juvenile granulosa cell tumor is a rare tumor diagnosed in children, which can present with precocious puberty. We have reported a case of a 6-month-old female patient who presented with precocious puberty. Abdominopelvic imaging revealed a large mixed cystic and solid mass, with internal solid enhancement, and restricted diffusion. At surgery, mass was confirmed to arise from the left ovary, and histopathology confirmed juvenile granulosa cell tumor. We provide a literature review of juvenile granulosa cell tumor and discuss imaging characteristics of this diagnosis.

20.
J Endocr Soc ; 5(9): bvab098, 2021 Sep 01.
Article in English | MEDLINE | ID: mdl-34286167

ABSTRACT

INTRODUCTION: GNAS mutations have been reported in both McCune-Albright syndrome (MAS) and juvenile granulosa cell tumors (JGCT) but have never been reported simultaneously in the same patient. CASE PRESENTATION: A 15-year-old girl developed secondary oligomenorrhea. Laboratory studies revealed suppressed gonadotropin levels with markedly elevated estradiol and inhibin B levels. Pelvic ultrasound showed a 12-cm heterogeneous right adnexal mass; pelvic magnetic resonance imaging to further characterize the mass displayed heterogeneous bilateral femoral bone lesions initially concerning for metastatic disease. Positron emission tomography/computed tomography showed minimal 18F-fluorodeoxyglucose (FDG) uptake in the pelvic mass but unexpectedly revealed FDG uptake throughout the skeleton, concerning for polyostotic fibrous dysplasia in the context of MAS. The adnexal mass was excised and pathology confirmed a JGCT. The patient's affected bone and JGCT tissue revealed the same pathogenic GNAS p.R201C mutation, while her peripheral blood contained wild-type arginine at codon 201. CONCLUSION: This mutation has been previously reported in cases of MAS and JGCT but never simultaneously in the same patient. This demonstration of a GNAS mutation underlying both JGCT and MAS in the same patient raises questions about appropriate surveillance for patients with these conditions.

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