title: Successful treatment for retroperitoneal cavernous hemangioma adjacent to the renal hilum via the laparoscopic approach: a case report.
abstract: BACKGROUND
  Cavernous hemangiomas are common benign tumors of the skin or liver but can also rarely originate from the retroperitoneal space, especially adjacent to the renal hilum. Qualitative characterization of these retroperitoneal tumors using available imaging modalities is relatively difficult.
  
  
  METHODS
  A 40-year-old Japanese woman was incidentally noted to have a round homogenous tumor adjacent to the left renal hilum on computed tomography. The preoperative diagnosis was paraganglioma according to hormonal and clinical findings. The tumor was successfully resected via a laparoscopic approach, and histopathological examination of the tumor revealed cavernous hemangioma.
  
  
  CONCLUSIONS
  Cavernous hemangioma is a rare but relatively benign disease when considering the different types of retroperitoneal tumors. We were able to effectively treat the retroperitoneal cavernous hemangioma via laparoscopy.
authors.affiliation: Department of Nephro-urology, Nagasaki University Graduate School of Biomedical Sciences, 1-7-1 Sakamoto, Nagasaki 852-8501, Japan. tigawa@nagasaki-u.ac.jp.
authors.forename: Tsukasa
authors.initials: T
authors.lastname: Igawa
authors.forename: Shin-Ichi
authors.initials: S
authors.lastname: Watanabe
authors.forename: Toru
authors.initials: T
authors.lastname: Onita
authors.forename: Hideki
authors.initials: H
authors.lastname: Sakai