A Rare Case of Incidental Urachal Mucinous Cystadenocarcinoma

The urachus is a remnant of the embryonic allantois that connects the urinary bladder to the umbilicus. In most cases, it commonly obliterates before birth. Here we present the case of a 60-year-old man with a past medical history of human immunodeficiency virus (HIV) and anal human papillomavirus (HPV). He was referred for an abdominal mass that had been found incidentally while being admitted for an acute kidney injury; it had been excised, and pathological examination showed urachal mucinous cystadenocarcinoma. Surgical excision is performed for the majority of cases with a higher survival rate when diagnosed early.