Anatomical Science International

, Volume 93, Issue 4, pp 563–565 | Cite as

A case of pancake kidney with a single ureter in the retroperitoneal space

  • Kasuga Horai
  • Munekazu NaitoEmail author
  • Tomiko Yakura
  • Yuka Furuya
  • Yusuke Ohmichi
  • Mika Ohmichi
  • Takayoshi Miyaki
  • Takashi Nakano
Case Report


The pancake kidney (PK) is a rare type of renal anomaly in which both kidneys completely fuse without an isthmus. In the previous reports, PKs have double ureters and are located in the pelvic cavity. We encountered a rare case of PK with a single ureter, which is located in the left retroperitoneal space, in a 95-year-old female cadaver, which was detected during a dissection course. In our case, the major calyces joined to form a single renal pelvis, which continued as a single ureter. To the best of our knowledge, this is the first report on PK with a single ureter that is located not in the pelvic cavity but in the retroperitoneal space. The knowledge of such anomalous presentation is important to avoid any complications during retroperitoneal surgery.


Fused kidney Pancake kidney Single ureter 



The authors wish to thank Mr. Kazuto Arimura, Mr. Junji Goto, Ms. Kaori Hasegawa, and Ms. Yoshiko Kunita for their excellent secretarial and technical assistance.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Ethical approval and consent to participate

In this study, we examined a cadaver donated for medical research according to Japanese law (Act No. 56 of 1983). We require the consent for donation from the donor and their family during their life. Following the guidelines of the Japanese Association of Anatomists (item 4. 5), a rare case encountered during a routine dissection class does not need to obtain a statement on ethics approval.


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Copyright information

© Japanese Association of Anatomists 2018

Authors and Affiliations

  1. 1.Department of AnatomyAichi Medical UniversityNagakuteJapan

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