title: Mixed epithelial and stromal tumor of the kidney or adult mesoblastic nephroma: an update.
abstract: OBJECTIVE
  Our aim was to review the spectrum of usual and unusual clinical and morphologic findings observed in mixed epithelial and stromal tumor of the kidney (MEST).
  
  
  METHODS
  On the basis of MEDLINE database searches, we assessed all aspects of MEST or adult mesoblastic nephroma since the first report in 1997 till the end of 2009.
  
  
  RESULTS
  Mixed epithelial and stromal tumor is a relatively rare and distinct neoplasm of the kidney that should be distinguished from other renal neoplasms. Although the overall prognosis is favorable, recurrence and malignant transformation of MEST can occur
  
  
  CONCLUSIONS
  It is difficult to distinguish benign or malignant nature on imaging studies.
authors.affiliation: Department of Urology, Kamkar Hospital, Qom University of Medical Sciences, Qom, Iran. moslemi@muq.ac.ir
authors.forename: Mohammad Kazem
authors.initials: MK
authors.lastname: Moslemi
mesh_terms: D002292:Carcinoma, Renal Cell / Q000175:diagnosis*; D003937:Diagnosis, Differential; D006801:Humans; D007680:Kidney Neoplasms / Q000175:diagnosis*; D018201:Nephroma, Mesoblastic / Q000175:diagnosis*