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"Urachal anomalies are very rare. Since Cabrolius` report of patent urachus in 1550, only 315 cases have been collected in the literature. Failure of the urachal lumen to close and completely obliterate causes one of several anomalies. These have been classified into four distinct entities by Blichert-Tott and Neilsen, Who also tabulated the incidence of each variant in the 315 reported cases : patent urachus , 48 per cent ; urachal cyst , 31 percent ; urachal sinus or alternating sinus, 18 per cent , and vesicourachal diverticulum, per cent . A brief discussion of embryology, symptoms , histopathology , diagnosis and treatment is made and a case of congenital patent urachus is reported here at Korea General Hospital."
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