Urachal cysts are unusual anomalies resulting from incomplete closure
of the urachus. They comprise 38 per cent of urachal abnormalities. Th
ey present commonly in childhood, and there are only 20 reported cases
of urachal cysts presenting in a person over the age of 40. Only one
reported case appears of urachal-colonic fistula, and this was in the
setting of colonic diverticulitis. This report presents the second rep
orted case of urachal-colonic fistula and the first case of a fistula
in a patient with a normal colon. The pathophysiology and management o
f urachal cyst are discussed.