| Summary: | The disease of urachus are seen not so frequently, and th e urachal tumors in inflammatory origin are more rarely. Such a case which has been experienced in our clinic has been reported here. A 16 year-o l d student has been complained periodically with the frequency since several years befor. A half sphere shaped tumor at infraumbilical region was subjectively observed since 3 mmonths befor, There is no significant f i nding in cystogram, however, a dark-red knot of .about needle top size was recognized at the dome of the bladder. By use of cystoscopy, this malignant urachus tumor pre-operatively diagnosed was extirpated. The tumor showed the intensive adhesion to peritonum, omentum and rectus sheath. The wall of bladder was partially resected as mass. Post operative course was regularly. In the histological exam ination, the fiinding of this extirpated organ was different from that of malignant tumor, and was the typical inflammatory urachus tumor with chief change of acido-philic infiltration.
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