title: Magnetic resonance imaging assessment of gluteal fat grafts.
abstract: BACKGROUND
  One goal of lipoplasty is to create a round and projected buttock contour. Despite multiple papers evaluating lipoinjection, controversies still remain.
  
  
  METHODS
  This report describes a series of patients who underwent liposuction, gluteal lipoinjection, and evaluation with magnetic resonance imaging (MRI). From January 2003 to January 2004, the patients scheduled for contour surgery by the investigators were evaluated using MRI, photographic records, and gluteal circumference measurement 1 week before surgery, then 2 weeks and 3 months after the procedure. A statistical analysis was performed for 10 patients who received, on the average, a 350-ml injection of fat obtained during liposuction.
  
  
  RESULTS
  Gluteus muscle volume increased, reaching a higher level 2 weeks after the injection than the level 3 months afterward (p < 0.001). The gluteal circumference, modified 2 weeks after surgery by about 1 to 3 cm, came back to previous values 3 months after the procedure (p < 0.05), a phenomena interpreted as reabsorption and resolution of the postoperative edema. There is no correlation between the gluteus muscle volume obtained by MRI and the gluteal circumference (p > 0.05).
  
  
  CONCLUSIONS
  The findings led to the conclusion that enhancement of the gluteal contour after fat injection results from survival of the injected tissue 3 months after the surgery, which was objectively evaluated by MRI as having a calculated reabsorption rate of 24% to 36%.
authors.affiliation: Division of Plastic Surgery, School of Medicine, Universidad de Antioquia, Cll 64 Cr 51 D. Hospital Universitario San Vicente de Paul, Medellín, Colombia.
authors.forename: Germán A
authors.initials: GA
authors.lastname: Wolf
authors.forename: Sabrina
authors.initials: S
authors.lastname: Gallego
authors.forename: Alfredo S
authors.initials: AS
authors.lastname: Patrón
authors.forename: Federico
authors.initials: F
authors.lastname: Ramírez
authors.forename: Jorge A
authors.initials: JA
authors.lastname: de Delgado
authors.forename: Alberto
authors.initials: A
authors.lastname: Echeverri
authors.forename: Mónica M
authors.initials: MM
authors.lastname: García
mesh_terms: D000273:Adipose Tissue / Q000637:transplantation*; D000328:Adult; D002081:Buttocks / Q000473:pathology / Q000601:surgery*; D005260:Female; D006801:Humans; D015187:Lipectomy; D008279:Magnetic Resonance Imaging; D008297:Male; D015999:Multivariate Analysis