Seven cases of urachal anomalies are presented. The spectrum of the disorder and the criteria for ultrasound diagnosis are described. Six of seven cases were correctly diagnosed pre-operatively with diagnostic ultrasound, but one case with no cystic component was missed. The appearance of a fixed, midline, cystic, extraperitoneal swelling between the umbilicus and the bladder should suggest the diagnosis.
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Holten et al. (1996) studied this question.
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