The urachus is a remnant of the intraembryonic portion of the allantois. The urachus is an extraperitoneal structure located in the space of Retzius (which is bounded by the transversalis fascia ventrally and the parietal peritoneum dorsally). If the urachus persists beyond birth, it can give rise to a number of congenital and acquired disorders. Congenital disorders include a patent urachus, urachal sinus, vesicourachal diverticulum, urachal cyst, and umbilical-urachal sinus. Acquired conditions relating to these congenital anomalies include infection, which is the most common complication, as well as benign and malignant neoplasms. This is a 32 year old male with umblical mass.
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