title: Correlation of single-lumen silicone implant integrity with chemical shift artifact on T2-weighted magnetic resonance images.
abstract: OBJECTIVE
  To correlate the integrity of single-lumen silicone gel implants with chemical shift artifact (CSA) associated with infolding of the elastomer shell.
  
  
  METHODS
  The T2-weighted images of presurgical MRI examinations of 54 implants were retrospectively reviewed by two breast radiologists blinded to the operative and pathologic findings. CSA associated with intraluminal membranes was quantified by determining the fraction of membranes with it and categorized as minimal (0-1/3 of membranes involved), moderate (>1/3- <2/3), and marked (2/3 to all). CSA was qualified by noting whether CSA intensity of the membranes was less than or similar to that of blood vessels. The CSA was correlated with the surgical or pathology findings to judge integrity of the implant.
  
  
  RESULTS
  Nineteen implants were intact, 35 were dysfunctional (gel leakage or rupture). Twenty-eight of 29 (97%) with a minimal fraction of membranes with CSA were dysfunctional; 17/21 (81%) with CSA associated with a marked fraction of membranes were intact (P < 0.001). All 28 implants with CSA intensity less than vessels were dysfunctional, 19/26 (73%) with CSA equal to vessels were intact (P < 0.001). All 25 implants with minimal CSA and intensity less than vessels were dysfunctional. Seventeen of 19 (89%) implants with CSA associated with a marked fraction of membranes and intensity equal to vessels were intact (P = 0.02). The magnetic resonance imaging (MRI) signs were combined with strong CSA as a predictor of integrity, and 22 of 26 (85%) implants were correctly diagnosed, 4 dysfunctional and 18 intact (P < 0.0001).
  
  
  CONCLUSIONS
  CSA correlates with integrity of silicone gel implants on T2-weighted images and can be used with other MRI signs to improve diagnosis.
authors.affiliation: Department of Radiology, Geisinger Health System, Danville, Pennsylvania 17822, USA. tjmurphy@geisinger.edu
authors.forename: Timothy J
authors.initials: TJ
authors.lastname: Murphy
authors.forename: Catherine W
authors.initials: CW
authors.lastname: Piccoli
authors.forename: Donald G
authors.initials: DG
authors.lastname: Mitchell
mesh_terms: D016477:Artifacts; D001940:Breast / Q000473:pathology; D018427:Breast Implants; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D008875:Middle Aged; D011475:Prosthesis Failure; D012189:Retrospective Studies; D012422:Rupture, Spontaneous / Q000175:diagnosis; D020034:Silicone Gels
chemical_list: D020034:Silicone Gels