Rare case of an unsual para rectal mass: Ectopic seminal vesicle

Seminal vesicles are accessory glands of the male genitourinary system and contribute substantially to ejaculate volume, playing a key role in sperm motility and fertility. Congenital abnormalities—most commonly agenesis, fusion, and cystic malformations—are uncommon but well described on imaging, whereas ectopic seminal vesicles are exceedingly rare. We report a 79-year-old man with a history of squamous cell carcinoma of the larynx in whom a right pararectal mass was detected on staging CT and initially suspected to represent lymphadenopathy. CT-guided biopsy and histopathological analysis demonstrated seminal vesicle–type tissue, consistent with an ectopic seminal vesicle. To our knowledge, this represents only the second reported case of an ectopic seminal vesicle, the first case having described an inguinal location.