urachal diverticulum

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urachal diverticulum — a usually asymptomatic type of vesical diverticulum resulting from a urachus that has closed at the umbilical end but not at the bladder end; seen most often in children, those with prune belly syndrome, and persons with a bladder outlet… … Medical dictionary
fistula — An abnormal passage from one epithelial surface to another epithelial surface. [L. a pipe, a tube] abdominal f. a fistulous passage connecting one of the abdominal viscera … Medical dictionary

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