title: Clinical-radiologic correlation of mixed epithelial and stromal tumor of the kidneys: Cases analysis.
abstract: BACKGROUND
  Mixed epithelial and stromal tumor of the kidney (MESTK) is a rare tumor, with few malignant cases reported. Occurring mostly in middle-aged women, it is characterized by a biphasic pathological structure.
  
  
  METHODS
  This study retrospectively reviewed the imaging findings and medical records of six MESTK cases of a single institution in a 10-year period.
  
  
  RESULTS
  All of the patients were middle-aged women without hormone therapy history. The typical image was a renal tumor with varied cystic components. Half of the cases had sinus invagination, but only one had intratumor calcification. On imaging studies, four were Bosniak Category IV, one was Category III, and one presented as a solid tumor. The mean RENAL nephrometry score was 9.3. Five patients underwent partial nephrectomy, with no statistical renal functional deterioration after nephron-sparing surgery. There were no peri-operative complications.
  
  
  CONCLUSIONS
  Surgery remains the treatment of choice for MESTK, and nephron-sparing surgery should be considered in feasible cases.
authors.affiliation: Department of Urology, Cheng-Hsin General Hospital, Taipei, Taiwan, ROC.
authors.forename: Sheng-Han
authors.initials: SH
authors.lastname: Tsai
authors.affiliation: Department of Radiology, Cheng-Hsin General Hospital, Taipei, Taiwan, ROC; National Yang-Ming University School of Medicine, Taipei, Taiwan, ROC. Electronic address: ch9400@chgh.org.tw.
authors.forename: Jia-Hwia
authors.initials: JH
authors.lastname: Wang
authors.affiliation: National Yang-Ming University School of Medicine, Taipei, Taiwan, ROC; Department of Radiology, Taipei Veterans General Hospital, Taipei, Taiwan, ROC.
authors.forename: Yi-Chen
authors.initials: YC
authors.lastname: Lai
authors.affiliation: National Yang-Ming University School of Medicine, Taipei, Taiwan, ROC; Department of Urology, Taipei Veterans General Hospital, Taipei, Taiwan, ROC.
authors.forename: Yen-Hwa
authors.initials: YH
authors.lastname: Chang
authors.affiliation: National Yang-Ming University School of Medicine, Taipei, Taiwan, ROC; Department of Urology, Taipei Veterans General Hospital, Taipei, Taiwan, ROC.
authors.forename: Hsiao-Jen
authors.initials: HJ
authors.lastname: Chung
authors.affiliation: Department of Urology, Cheng-Hsin General Hospital, Taipei, Taiwan, ROC; National Yang-Ming University School of Medicine, Taipei, Taiwan, ROC.
authors.forename: Luke S
authors.initials: LS
authors.lastname: Chang
mesh_terms: D000328:Adult; D000368:Aged; D005260:Female; D006801:Humans; D007668:Kidney / Q000473:pathology; D007680:Kidney Neoplasms / Q000000981:diagnostic imaging* / Q000601:surgery; D008875:Middle Aged; D018193:Neoplasms, Complex and Mixed / Q000000981:diagnostic imaging* / Q000601:surgery; D009375:Neoplasms, Glandular and Epithelial / Q000000981:diagnostic imaging* / Q000601:surgery; D009392:Nephrectomy; D012189:Retrospective Studies; D014057:Tomography, X-Ray Computed
keywords: Bosniak category; computed tomography; mixed epithelial and stromal tumor of the kidney; nephron-sparing surgery