title: Comparative study of CT appearances in mucinous tubular and spindle cell carcinoma and collecting duct carcinoma of the kidney.
abstract: OBJECTIVE
  To characterize the multidetector CT (MDCT) imaging characteristics of mucinous tubular and spindle cell carcinoma (MTSCC) and collecting duct carcinoma (CDC) of the kidney.
  
  
  METHODS
  21 patients with MTSCC and 18 patients with CDC were studied retrospectively. MDCT was undertaken to investigate differences in tumour characteristics.
  
  
  RESULTS
  Five patients with MTSCC had calcifications as did nine patients with CDC (p = 0.108). In three patients with MTSCC and four patients with CDC, the tumours had a clear boundary (p = 0.682). No patient with MTSCC had retroperitoneal lymph node metastasis as did five patients with CDC (p = 0.015). 16 patients with MTSCC showed homogeneous enhancement, whereas 11 patients with CDC showed heterogeneous enhancement (p = 0.025). The attenuation value of CDC tumours was greater than that of MTSCC and normal renal parenchyma on an unenhanced CT (p = 0.027). MTSCC and CDC tumour enhancement was less than the normal renal cortex and medulla in all phases (p < 0.001). Tumour enhancement was greater for CDC than that for MTSCC in all phases (p = 0.011, p = 0.006 and p = 0.052).
  
  
  CONCLUSIONS
  Unenhanced and dynamic MDCT may aid in diagnosis and differentiation of MTSCC and CDC of the kidney.
  
  
  CONCLUSIONS
  This is the first series evaluating the imaging findings of MTSCC and CDC of which we are aware, and identification of such findings may improve diagnosis of these two rare tumours.
authors.affiliation: Department of Medical Imaging, Subei People's Hospital, Medical School of Yangzhou University, Yangzhou, China.
authors.forename: Jingtao
authors.initials: J
authors.lastname: Wu
authors.affiliation: Department of Medical Imaging, Subei People's Hospital, Medical School of Yangzhou University, Yangzhou, China.
authors.forename: Qingqiang
authors.initials: Q
authors.lastname: Zhu
authors.affiliation: Department of Medical Imaging, Subei People's Hospital, Medical School of Yangzhou University, Yangzhou, China.
authors.forename: Wenrong
authors.initials: W
authors.lastname: Zhu
authors.affiliation: Department of Medical Imaging, Subei People's Hospital, Medical School of Yangzhou University, Yangzhou, China.
authors.forename: Wenxin
authors.initials: W
authors.lastname: Chen
authors.affiliation: Department of Medical Imaging, Subei People's Hospital, Medical School of Yangzhou University, Yangzhou, China.
authors.forename: Shouan
authors.initials: S
authors.lastname: Wang
mesh_terms: D002288:Adenocarcinoma, Mucinous / Q000000981:diagnostic imaging*; D000328:Adult; D000368:Aged; D002292:Carcinoma, Renal Cell / Q000000981:diagnostic imaging*; D005260:Female; D006801:Humans; D007668:Kidney / Q000000981:diagnostic imaging; D007680:Kidney Neoplasms / Q000000981:diagnostic imaging*; D008297:Male; D008875:Middle Aged; D061330:Multidetector Computed Tomography; D015203:Reproducibility of Results; D012189:Retrospective Studies; D055815:Young Adult