[MUCINOUS CYSTIC TUMOR OF LOW MALIGNANT POTENTIAL THOUGHT TO BE OF URACHAL ORIGIN: A CASE REPORT].

Mucinous cystic tumor of low malignant potential (MCTLMP) is a very rare disease.The patient was a 50-year-old man. Contrast-enhanced computed tomography and magnetic resonance imaging showed a multiocular cystic lesion on the top of the bladder. We performed surgery to remove the tumor for definitive diagnosis. Intraoperative rapid pathological diagnosis of the cyst wall showed no malignant findings, so we performed combined resection of the peritoneum and part of the bladder wall.Based on imaging findings, tumor location, and pathological and immunostaining findings (CK20 and CDX2 positivity; β-catenin negativity), the patient was diagnosed with MCTLMP thought to be of urachal origin. After the operation, recurrence was not observed.