[Cystadenocarcinoma in situ of the urachus: a clinical case].

Urachal carcinoma is a rare neoplasm which represents 0.01% cancers in adults. If this neoplasm is unusual, the development of cystadenocarcinoma on a urachal cyst is still more rare. The surgical treatment of choice is en-bloc excision of umbilicus and median umbilical ligament with partial cystectomy. As the urachal cystadenocarcinoma of Authors' patient was in situ and without bladder-invasion, they performed a more conservative treatment without partial cystectomy. They believe that this treatment may be indicated in association with a close follow-up after surgery.