title: Relationship between divided-shaped kidney and collecting system duplication.
abstract: OBJECTIVE
  We aimed to assess the incidence of divided-shaped kidney and the relationship between divided-shaped kidney and collecting system duplication.
  
  
  METHODS
  Between May 1 and June 30, 2012, 857 patients (men:women, 493:364; mean age 39.6 years; age range 2-98 years) with 1699 kidneys underwent enhanced computed tomography of the abdomen and pelvis at our institution. Sixty kidneys were excluded (tumor, 3; percutaneous nephrostomy, 9; polycystic kidney disease, 4; renal injury, 1; infarct, 1; hydronephrosis, 18; parapelvic cyst, 17; artifact, 5; horseshoe kidney, 2). Finally, 845 patients and 1639 kidneys were included. The number of cases of prominent column of Bertin (divided by grade of prominence as either divided-shaped kidney or hypertrophy) and collecting system duplication (bifid, partial, and complete) were evaluated. Fisher exact test was used to determine the relationship between divided-shaped kidney and collecting system duplication, and between hypertrophy and collecting system duplication.
  
  
  RESULTS
  Of 1639 kidneys, 66 (4%) were divided-shaped kidneys, and 88 (5%) had collecting system duplication (bifid, 69; partial, 19; complete, 0); among the 66 divided-shaped kidneys, 28 (42%) had collecting system duplication. Among the 429 cases of hypertrophy and 1144 normal kidneys, 51 (11.9%) and 9 (0.8%) had collecting system duplication, respectively.
  
  
  CONCLUSIONS
  The incidence of divided-shaped kidney was 4%, and there was a significant association between divided-shaped kidney and collecting system duplication.
authors: Department of Radiology, Chungbuk National University Hospital, 776, 1 Sunhwan-ro, Seowon-gu, Cheongju-si, Chungcheongbuk-do, 362-711, Korea. jhlkafka@naver.com.
authors: Ji Hyung
authors: JH
authors: Lee
authors: Department of Radiology, Chungbuk National University Hospital, 776, 1 Sunhwan-ro, Seowon-gu, Cheongju-si, Chungcheongbuk-do, 362-711, Korea. sircircle@hanmail.net.|Department of Radiology, College of Medicine, Chungbuk National University, 52, Naesudong-ro, Seowon-gu, Cheongju-si, Chungcheongbuk-do, 362-763, Korea. sircircle@hanmail.net.
authors: Bum Sang
authors: BS
authors: Cho
authors: Department of Radiology, Chungbuk National University Hospital, 776, 1 Sunhwan-ro, Seowon-gu, Cheongju-si, Chungcheongbuk-do, 362-711, Korea. sixtwin@hanmail.net.
authors: Yook
authors: Y
authors: Kim
authors: Department of Radiology, Chungbuk National University Hospital, 776, 1 Sunhwan-ro, Seowon-gu, Cheongju-si, Chungcheongbuk-do, 362-711, Korea. happymsjs@hotmail.com.
authors: Jisun
authors: J
authors: Lee
authors: Department of Radiology, Chungbuk National University Hospital, 776, 1 Sunhwan-ro, Seowon-gu, Cheongju-si, Chungcheongbuk-do, 362-711, Korea. sheepist@paran.com.
authors: Min Ho
authors: MH
authors: Kang
authors: Department of Radiology, Chungbuk National University Hospital, 776, 1 Sunhwan-ro, Seowon-gu, Cheongju-si, Chungcheongbuk-do, 362-711, Korea. sjkim@chungbuk.ac.kr.|Department of Radiology, College of Medicine, Chungbuk National University, 52, Naesudong-ro, Seowon-gu, Cheongju-si, Chungcheongbuk-do, 362-763, Korea. sjkim@chungbuk.ac.kr.
authors: Sung Jin
authors: SJ
authors: Kim
authors: Department of Radiology, Chungbuk National University Hospital, 776, 1 Sunhwan-ro, Seowon-gu, Cheongju-si, Chungcheongbuk-do, 362-711, Korea. kspark9@chungbuk.ac.kr.|Department of Radiology, College of Medicine, Chungbuk National University, 52, Naesudong-ro, Seowon-gu, Cheongju-si, Chungcheongbuk-do, 362-763, Korea. kspark9@chungbuk.ac.kr.
authors: Kil Sun
authors: KS
authors: Park
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002648:Child; D002675:Child, Preschool; D003287:Contrast Media; D005260:Female; D006801:Humans; D006984:Hypertrophy / Q000000981:diagnostic imaging; D007668:Kidney / Q000002:abnormalities* / Q000000981:diagnostic imaging* / Q000473:pathology; D008297:Male; D008875:Middle Aged; D011856:Radiographic Image Enhancement; D012189:Retrospective Studies; D014057:Tomography, X-Ray Computed; D055815:Young Adult
chemical_list: D003287:Contrast Media
keywords: Bifid or double; Kidney; Multidetector-row computed tomography; Ureter