Urachal Adenocarcinoma: A Case Report of a Rare Tumor.

Urachal adenocarcinoma is a rare and aggressive bladder cancer involving the urachus, an embryological fibrous remnant of the allantois extending from the bladder to the umbilicus. Usually discovered in the advanced stages, this cancer can commonly present with a poor prognosis. We report a case of a 34-year-old male patient with an unremarkable medical history who presented to the emergency department with severe, sudden onset, sharp abdominal pain. Follow-up imaging revealed a tubular structure with mildly thickened and enhancing margins emanating from the anterior wall of the urinary bladder toward the umbilicus with peritoneal dystrophic small calcifications. These findings were susceptive to this rare tumor, and subsequent biopsy was indicative of a urachal mucinous adenocarcinoma.