A Case of Borderline Mucinous Cystadenoma Thought to be of Urachal Origin

• Published in: Nihon Rinsho Geka Gakkai Zasshi (Journal of Japan Surgical Association) Vol. 75; no. 5; pp. 1418 - 1422
• Main Authors: YAGUCHI, Kiichiro, GOMYO, Yoshihito, SAITO, Hiroyasu, IKENO, Tatsuo, SAKAGUCHI, Hiromi, MIYAMOTO, Hideo
• Format: Journal Article
• Language: Japanese
• Published: Japan Surgical Association 2014
• Subjects: cystadenoma; mucinous; urachus
• ISSN: 1345-2843; 1882-5133
• DOI: 10.3919/jjsa.75.1418

A 75-year-old man was referred to the Department of Urology after prostate cancer was suspected due to elevated prostate-specific antigen (PSA) levels. Because a cystic tumor was seen adjacent to the anterosuperior aspect of the bladder, the patient was referred to the Department of Surgery for operative management. Detailed preoperative examination indicated a low probability of a metastatic tumor. In addition, since it was not possible to determine whether the tumor was benign or malignant, surgery to remove the tumor was performed for a definitive diagnosis. A 6-cm tumor was seen adjacent to the bladder dome within the preperitoneal space. The tumor was not exposed to the inside of the abdominal cavity. Because detachment from the bladder was difficult, part of the bladder wall was resected. Pathologically, the resected sample had the characteristics of a borderline mucinous cystadenoma. Whether the tumor was of urachal origin could not be determined intraoperatively because the urachus could not be confirmed, but on the basis of imaging findings, the location of the tumor, and the pathological findings as a whole, a borderline mucinous cystadenoma of urachal origin was diagnosed. This case of an extremely rare disease is reported along with a review of the relevant literature.