title: Evaluation of percutaneous biopsies of renal masses under MRI-guidance: a retrospective study about 26 cases.
abstract: OBJECTIVE
  To determine whether MRI allows safe and accurate guidance for biopsies of renal masses.
  
  
  METHODS
  Between May 2010 and September 2013, 26 patients (15 men and 11 women) with 26 renal masses underwent MRI-guided percutaneous biopsy. For each patient, we retrospectively collected the epidemiological, procedural and histopathological data.
  
  
  RESULTS
  Mean size of tumour was 3.6 cm (range 0.6 - 9 cm). Mean procedure time was 48 minutes (range 37 - 70 min). Malignancy was found in the percutaneous samples in 81 % (21/26) of the masses. All these cases were considered as true positive biopsies. Benignity was found in the percutaneous samples in 5/26 (19 %) of the masses but was confirmed only in 3 cases. The other 2 cases included one false negative case and one undetermined biopsy, as patient was lost to follow-up. The sensitivity, specificity, positive predictive value (PPV), negative predictive value (NPV) and accuracy of this study were 95.4 %, 100 %, 100 %, 75 % and 96 %, respectively
  
  
  CONCLUSIONS
  MRI-guidance is safe and accurate to target renal masses.
authors.affiliation: Department of Interventional Radiology, Nouvel Hôpital Civil, Strasbourg, France, juliengarnon@gmail.com.
authors.forename: J
authors.initials: J
authors.lastname: Garnon
authors.forename: A
authors.initials: A
authors.lastname: Schlier
authors.forename: X
authors.initials: X
authors.lastname: Buy
authors.forename: G
authors.initials: G
authors.lastname: Tsoumakidou
authors.forename: M
authors.initials: M
authors.lastname: de Mathelin
authors.forename: E
authors.initials: E
authors.lastname: Breton
authors.forename: A
authors.initials: A
authors.lastname: Gangi
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001707:Biopsy, Needle / Q000379:methods; D005260:Female; D006801:Humans; D061705:Image-Guided Biopsy / Q000379:methods; D007668:Kidney / Q000473:pathology*; D007674:Kidney Diseases / Q000473:pathology*; D007680:Kidney Neoplasms / Q000473:pathology; D053783:Magnetic Resonance Imaging, Interventional / Q000379:methods; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D012680:Sensitivity and Specificity; D055815:Young Adult