Incidental Detection of Leydig Cell Tumor Via Fluorine-18-Choline PET/CT in a Patient With Recurrent Prostate Cancer Disease

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We report a case of a 62-year-old man with biochemical recurrence of prostate cancer disease, investigated by fluorine-18-Choline (18F-FCH) PET/CT. 18F-FCH PET/CT demonstrated focal increased uptake of 18F-FCH inside the right testis, suggestive for distant recurrent disease. On testis removal, a Leydig cell tumor of 2.5 cm in diameter was unexpectedly found. 18F-FCH PET/CT may demonstrate tumors other than prostate cancer.

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