title: Mesoblastic nephroma in adulthood: a case report.
abstract: BACKGROUND
  Mesoblastic nephroma is an uncommon renal tumor of infancy and rarely occurs in adults. We report an adult case of mesoblastic nephroma.
  
  
  METHODS
  A 50-year-old woman was found incidentally to have a right renal mass by abdominal ultrasonography. Computed tomography and magnetic resonance imaging revealed a heterogeneous tumor and angiography showed a mixture of hypervascularity and hypovascularity. Right radical nephrectomy was performed.
  
  
  RESULTS
  The tumor was an encapsulated yellowish solid mass. Microscopically, the tumor was composed of spindle cell proliferation. Atypia and mitoses were not identified. Among the tumor cells, there were tubular arranged epithelial elements.
  
  
  CONCLUSIONS
  The patient was free of recurrence 14 months postoperatively. Mesoblastic nephroma is classified as a benign tumor but recurrence and malignant formation of this tumor have been reported so regular postoperative follow up is required.
authors.affiliation: Department of Urology, Yamaguchi University School of Medicine, Ube, Japan. Urol@po.cc.yamaguchi-u.ac.jp
authors.forename: K
authors.initials: K
authors.lastname: Shiraishi
authors.forename: M
authors.initials: M
authors.lastname: Yamamoto
authors.forename: T
authors.initials: T
authors.lastname: Gondo
authors.forename: S
authors.initials: S
authors.lastname: Shirataki
authors.forename: K
authors.initials: K
authors.lastname: Naito
mesh_terms: D017668:Age of Onset; D000792:Angiography; D005260:Female; D006801:Humans; D007680:Kidney Neoplasms / Q000175:diagnosis / Q000000981:diagnostic imaging / Q000473:pathology*; D008279:Magnetic Resonance Imaging; D008875:Middle Aged; D009392:Nephrectomy; D018201:Nephroma, Mesoblastic / Q000175:diagnosis / Q000000981:diagnostic imaging / Q000473:pathology*