A 20-year-old man was referred to our hospital for investigation of left scrotal swelling. CT scan showed intrascrotal fluid collection and calcification. Surgical exploration was performed, and histopathological diagnosis was serous papillary adenocarcinoma of the tunica vaginalis. Since it was believed that the carcinoma originated from the tunica vaginalis, left radical orchiectomy and hemiscrotal resection was performed. Patient survives without recurrence for 38 months after the surgery. Müllerian-type tumors such as serous papillary adenocarcinoma occurring in male are quite rare. In the literature, only 2 cases of serous papillary adenocarcinoma of the tunica vaginalis have been reported; ours is the 3rd case.
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