Urachal borderline mucinous cystadenoma

Rationale: Urachal borderline mucinous cystadenoma is very rare and has only 9 cases in the current literature with the biological behavior between adenoma and adenocarcinoma. Patient concerns:We reported a 41-year-old man with moderate lower abdominal pain, and the imaging examination found an irregular cystic lesion extending from umbilicus to the dome of urinary bladder with significant separations and calcifications. Diagnoses: The diagnosis was confirmed according to the specific anatomical location and pathological examination which was proved as mucinous cystadenoma with low malignant potential. Interventions: The patient undertook radical excision and partial cystectomy. Outcomes: His postoperative condition was good. Lessons: Urachal borderline mucinous cystadenoma can be located by image examination, which may also offer several diagnostic tips according to separation, calcification, and enhancement in computed tomography scan. When combined with pathological findings, qualitative diagnosis can be determined. Surgical resection should be chosen as an optimal treatment. Our present study reviewed the clinical and biological information of all previous cases which were diagnosed as urachal borderline mucinous cystadenoma and we supplemented more data for further study. Abbreviations: CA19–9 = carbohydrate antigen 19–9, CEA = carcinoembryonic antigen, CT = computed tomography, PMP = pseudomyxoma peritone, PSA = prostate-specific antigen, WHO = World Health Organization.