Prolapsed urachal sinus with pyourachus in an infant.

We report an infant who presented with a discharging single-lumen, tubular, and mucosa-lined umbilical mass and a large central abdominal mass, inferior to the umbilicus. At operation, the mass was discovered to be a prolapsed, open, and inflamed urachal sinus leading to a pyourachus. Primary total excision from dome of the bladder to the umbilicus led to smooth recovery with excellent results.