title: Primary epiploic appendagitis: evolutionary changes in CT appearance.
abstract: OBJECTIVE
  To determine the changes in the computed tomographic (CT) appearance of primary epiploic appendagitis.
  
  
  METHODS
  Clinical records and CT scans were reviewed in 10 patients who were initially suspected of having diverticulitis or appendicitis but were later determined to have primary epiploic appendagitis. The scans were obtained at the time of presentation and at follow-up 1-84 weeks later.
  
  
  RESULTS
  Initial CT characteristics included mean size of 14 x 21 mm, oval (n = 9) or round (n = 1) shape, mean attenuation of -53 HU, visceral (n = 10) or parietal (n = 7) peritoneal thickening, periappendageal fat stranding (n = 10), adjacent bowel wall thickening (n = 4) or compression (n = 2), and central high-attenuating dot (n = 2). Follow-up CT characteristics included residual abnormality (n = 9); mean size of 10 x 15 mm; oval (n = 6), round (n = 2), or indistinct (n = 1) shape; mean attenuation of -68 HU; visceral (n = 5) or parietal (n = 3) peritoneal thickening; periappendageal fat stranding (n = 1); and central high-attenuating dot (n = 1). CT characteristics of the remnant lesion included smaller lesion with fat attenuation (n = 6), nugget with soft-tissue attenuation (n = 2), and nondescript fat stranding (n = 1).
  
  
  CONCLUSIONS
  Awareness of the CT appearance of acute and healing primary epiploic appendagitis may help in the differential diagnosis of pericolonic abnormality.
authors.affiliation: Department of Radiology, Massachusetts General Hospital, Boston 02114, USA.
authors.forename: P M
authors.initials: PM
authors.lastname: Rao
authors.forename: J
authors.initials: J
authors.lastname: Wittenberg
authors.forename: J N
authors.initials: JN
authors.lastname: Lawrason
mesh_terms: D000328:Adult; D000368:Aged; D003092:Colitis / Q000000981:diagnostic imaging*; D003287:Contrast Media; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D014057:Tomography, X-Ray Computed
chemical_list: D003287:Contrast Media