An unusual localization of an infected urachal sinus

Failure of obliteration of the urachus in intrauterine life results in anatomically recognizable distinct anomalies. The urachus is located between the umbilicus and apex of the bladder. However, this anatomic feature does not always exist, and this may lead to misdiagnosis of the urachal pathologies. A 5-year-old boy with infected urachal sinus is presented. The urachus showed an unusual anatomic course with its extension from the umbilicus to the right lateral side of the bladder instead of the apex of the organ.