title: Assessment of renal shape of horseshoe kidney with multidetector row CT in adult patients: relationship between urolithiasis and renal isthmus.
abstract: OBJECTIVE
  The aim of this study was to evaluate the relationship between urolithiasis and characteristics of renal shape in adult patients with horseshoe kidney (HSK) diagnosed on multidetector row computed tomography (MDCT).
  
  
  METHODS
  We evaluated 36 patients with HSK and urolithiasis (Group A) and 70 patients with HSK without urolithiasis (Group B) whose disease was diagnosed on non-contrast MDCT. Two radiologists measured minimum width of the renal isthmus and maximum length of the renal pelvis and evaluated coexisting neoplastic diseases on axial computed tomographic (CT) images with 5-mm reconstruction, and we compared those measurements between the Groups A and B.
  
  
  RESULTS
  The overall mean maximum length of the renal pelvis, 12.7±9.2 mm, did not differ significantly between the 2 groups. Minimum isthmus width was larger in patients with HSK and urolithiasis (11.0±5.6 mm), than those without urolithiasis (9.5±5.1 mm). No patient in either groups had a urological renal tumor.
  
  
  CONCLUSIONS
  Patients of HSK might have tendency of a high incidence of stone formation. Because urolithiasis is a risk factor for tumors of the renal pelvis, monitoring of patients with HSK requires careful attention to isthmus width on CT images.
authors: Department of Radiology, Tokai University School of Medicine, 143 Shimokausya, Isehara, Kanagawa 259-1193, Japan. kawashu@is.icc.u-tokai.ac.jp.
authors: Shuichi
authors: S
authors: Kawada
authors: Tamaki
authors: T
authors: Ichikawa
authors: Jun
authors: J
authors: Koizumi
authors: Jun
authors: J
authors: Hashimoto
authors: Jun
authors: J
authors: Endo
authors: Kazunobu
authors: K
authors: Hashida
authors: Hiroshi
authors: H
authors: Yamamuro
authors: Takeshi
authors: T
authors: Nomoto
authors: Yuki
authors: Y
authors: Sakamoto
authors: Yutaka
authors: Y
authors: Imai
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D006801:Humans; D015994:Incidence; D007668:Kidney / Q000002:abnormalities* / Q000000981:diagnostic imaging* / Q000473:pathology; D007680:Kidney Neoplasms / Q000209:etiology; D007682:Kidney Pelvis / Q000473:pathology; D008297:Male; D008875:Middle Aged; D061330:Multidetector Computed Tomography; D012307:Risk Factors; D052878:Urolithiasis / Q000000981:diagnostic imaging* / Q000453:epidemiology / Q000209:etiology* / Q000473:pathology