title: How reliable is routine lumbar spine MRI for detection of renal cysts? Correlation with abdominal CT.
abstract: BACKGROUND
  Incidental renal cysts are a very common finding in routine lumbar spine magnetic resonance imaging (MRI). However, there is no report of the renal cyst detection rate on routine lumbar spine MRI.
  
  
  OBJECTIVE
  To determine the renal cyst detection rate in routine lumbar spine MRI based on findings of abdominal computed tomography (CT), and to investigate if the largest renal cyst seen by abdominal CT could be also detected by routine lumbar spine MRI.
  
  
  METHODS
  A retrospective study was conducted of 70 patients who underwent both routine lumbar spine MRI and abdominal CT between December 2011 and January 2014. The detection rate of all renal cysts>5 mm as well as the largest renal cyst seen by abdominal CT were assessed in routine lumbar spine MRI.
  
  
  RESULTS
  On routine lumbar spine MRI, the detection rate of renal cysts was 46.5% (73/157) for>5-mm renal cysts and 68.0% (34/50) for>10-mm renal cysts, correlating with abdominal CT. The detection rate of the largest renal cyst seen by abdominal CT was 60.0% (27/45). Non-detection of the largest renal cyst could be caused by upper positioning (n = 7), lateral positioning (n = 6), or relatively small cyst size (n = 5).
  
  
  CONCLUSIONS
  Approximately half of renal cysts>5 mm and two-thirds of renal cysts>10 mm were detected on routine lumbar spine MRI. However, radiologists should be aware that kidney lesions may not be included in the scan coverage of routine lumbar spine MRI.
authors.affiliation: Department of Radiology, Research Institute of Radiological Science, Medical Convergence Research Institute, Seoul, Republic of Korea Severance Biomedical Science Institute, Yonsei University College of Medicine, Seoul, Republic of Korea.
authors.forename: Hee Woo
authors.initials: HW
authors.lastname: Cho
authors.affiliation: Department of Radiology, Research Institute of Radiological Science, Medical Convergence Research Institute, Seoul, Republic of Korea Severance Biomedical Science Institute, Yonsei University College of Medicine, Seoul, Republic of Korea.
authors.forename: Young Han
authors.initials: YH
authors.lastname: Lee
authors.affiliation: Department of Radiology, Research Institute of Radiological Science, Medical Convergence Research Institute, Seoul, Republic of Korea Severance Biomedical Science Institute, Yonsei University College of Medicine, Seoul, Republic of Korea.
authors.forename: Soo Yoon
authors.initials: SY
authors.lastname: Chung
authors.affiliation: Department of Orthopedic Surgery, Yonsei University College of Medicine, Seoul, Republic of Korea.
authors.forename: Jin-Oh
authors.initials: JO
authors.lastname: Park
authors.affiliation: Department of Radiology, Research Institute of Radiological Science, Medical Convergence Research Institute, Seoul, Republic of Korea Severance Biomedical Science Institute, Yonsei University College of Medicine, Seoul, Republic of Korea jss@yuhs.ac.
authors.forename: Jin-Suck
authors.initials: JS
authors.lastname: Suh
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D003560:Cysts / Q000000981:diagnostic imaging / Q000473:pathology*; D005260:Female; D006801:Humans; D007668:Kidney / Q000000981:diagnostic imaging / Q000473:pathology; D007674:Kidney Diseases / Q000000981:diagnostic imaging / Q000473:pathology*; D008159:Lumbar Vertebrae / Q000000981:diagnostic imaging / Q000473:pathology; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D011860:Radiography, Abdominal; D015203:Reproducibility of Results; D012189:Retrospective Studies; D014057:Tomography, X-Ray Computed
keywords: Lumbar spine; computed tomography (CT); magnetic resonance imaging (MRI); renal cyst