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An ovary in luteal phase mimicking common iliac lymph node metastasis from a primary cutaneous peripheral primitive neuroectodermal tumour as revealed by 18-fluoro-2-deoxyglucose positron emission tomography

¹ Department of Nuclear Medicine, ² Department of Radiology and ³ Division of Gynecologic Oncology, Department of Obstetrics and Gynecology, Chang Gung Memorial Hospital and University, Taoyuan, Taiwan

Correspondence: Dr Hung-Hsueh Chou, Division of Gynecologic Oncology, Department of Obstetrics and Gynecology, Chang Gung Memorial Hospital & Chang Gung University, 5 Fu-Shin Street, Kueishan, Taoyuan 333, Taiwan

A 30-year-old female underwent surgical removal of a primary cutaneous peripheral primitive neuroectodermal tumour (PNET) of the left thigh. A subsequent 18-fluoro-2-deoxyglucose (FDG) positron emission tomography (PET) scan showed abnormal accumulation of FDG in the left upper pelvic region, consistent with metastasis to a left common iliac node. A series of follow-up imaging studies revealed that a cyst of the corpus luteum of ovary was responsible for the abnormal FDG accumulation.