title: [Pathological observation of 16 cases with non-epithelial tumor and tumor-like lesions of the prostate].
abstract: OBJECTIVE
  To investigate the diagnosis, differential diagnosis and prognosis of stromal tumors and tumor-like lesions of the prostate.
  
  
  METHODS
  By means of HE, immunohistochemistry and electron microscopy, the clinical and histological data of 16 cases with stromal tumors and tumor-like lesions of the prostate were observed. Some of them were followed-up.
  
  
  RESULTS
  Of the 16 cases, 6 presented stromal nodular hyperplasia, 3 were stromal sarcoma, 1 malignant phyllodes-type tumor, 3 leiomyosarcoma, 1 fibrosarcoma, and one non-Hodgkin's lymphoma.
  
  
  CONCLUSIONS
  Nearly all the leiomyomas of the prostate diagnosed previously are, in fact, stromal nodular hyperplasia. The phyllodes-type tumors are often confused with stromal sarcomas in needle biopsy specimens and cause difficulty in differential diagnosis. Diagnostic criteria of leiomyosarcoma, fibrosarcoma, non-Hodgkin's lymphoma of the prostate are the same as their counterparts in the soft tissue. Non-epithelial malignant tumors in prostate are of poor prognosis.
authors.affiliation: Department of Pathology, Beijing Friendship Hospital-Affiliate of Capital University of Medical Sciences, Beijing 100050, China. majun40@163.net
authors.forename: J
authors.initials: J
authors.lastname: Ma
authors.forename: S
authors.initials: S
authors.lastname: Huang
authors.forename: C
authors.initials: C
authors.lastname: Zhang
mesh_terms: D000368:Aged; D003937:Diagnosis, Differential; D006801:Humans; D007150:Immunohistochemistry; D008297:Male; D008875:Middle Aged; D009362:Neoplasm Metastasis; D011471:Prostatic Neoplasms / Q000473:pathology*; D012509:Sarcoma / Q000473:pathology*