Mucinous cystadenoma of a horseshoe kidney: A case report and literature review


  • Taku Mitome Department of Urology, Yokohama City University Graduate School of Medicine
  • Masahiro Yao
  • Udaka Naoko
  • Shusei Fusayasu
  • Koji Izumi
  • Kimito Osaka
  • Narihiko Hayashi
  • Noboru Nakaigawa
  • Yoji Nagashima
  • Yoshinobu Kubota



horseshoe kidney, mucinous cystadenoma


A 45-year-old man complained of a palpable mass in his left abdomen. Computed tomography showed a horseshoe kidney with a Bosniak type II complicated cyst from a left segment. Three years after his initial examination, due to the growing cystic lesion and the compression imposed on the urinary collecting system and surrounding organs, we performed a left heminephrectomy. The diagnosis was mucinous cystadenoma of the kidney. No recurrence was observed 6 months after surgery. The histopathology was unique since the inner surface of the cyst was covered by a mucin-positive columnar epithelium connected to a urothelium, with continuous transition between the two. This suggests that the mucinous tumour may have originated from a sequestered segment of the renal pelvic epithelium in the renal parenchyma.


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How to Cite

Mitome, T., Yao, M., Naoko, U., Fusayasu, S., Izumi, K., Osaka, K., Hayashi, N., Nakaigawa, N., Nagashima, Y., & Kubota, Y. (2015). Mucinous cystadenoma of a horseshoe kidney: A case report and literature review. Canadian Urological Association Journal, 9(1-2), E30–2.



Case Report