title: Rectal hemangiopericytoma in a 37-year-old woman: a case report and review of the literature.
abstract: BACKGROUND
  Hemangiopericytoma is an uncommon perivascular tumor. Rectal Hemangiopericytomas are extremely rare. To the best of our knowledge, only two cases have been reported in the literature.
  
  
  METHODS
  We report the case of a 37-year-old Asian woman with an Hemangiopericytoma rising from the anterior wall of her rectum. Abdominopelvic computed tomography showed a 7.4 cm solid mass between her uterus and her rectum. Heterogeneous gradual enhancement after intravenous injection of contrast material was noted with several tortuous vessels around her tumor. Intra-operative findings indicated a capsule and well-circumscribed solid tumor connecting with the anterior wall of her rectum by a small pedicle. With immunohistochemical stains, her tumor cells reacted positive for Bcl-2, CD34, and ki67 and negative for CD10, CD117, S100, and Desmin. Follow-up computed tomography scans have shown no tumor recurrence or metastasis signs.
  
  
  CONCLUSIONS
  Rectal Hemangiopericytoma is a rare tumor with non-specific imaging findings. Hemangiopericytomas should be included in the differential list when a massive tumor with heterogeneously gradual enhancement in the regions of the rectum is encountered.
authors.affiliation: Department of Medical Imaging, Jinling Hospital, Nanjing, Jiangsu 210002, China. guangminglu66@yahoo.com.cn.
authors.forename: Li
authors.initials: L
authors.lastname: Lu
authors.forename: Long Jiang
authors.initials: LJ
authors.lastname: Zhang
authors.forename: Chang Sheng
authors.initials: CS
authors.lastname: Zhou
authors.forename: Guang Ming
authors.initials: GM
authors.lastname: Lu