title: Subperiosteal hematoma of the iliac bone: imaging features of acute and chronic stages with emphasis on pathophysiology.
abstract: OBJECTIVE
  The goal of this work is to describe the radiological appearance and clinical presentation of subperiosteal iliac hematoma and present a review of the literature.
  
  
  METHODS
  We retrospectively reviewed the radiological and clinical files of 19 patients (age range: 12-75; mean: 47) who presented with acute or chronic subperiosteal iliac hematomas. Imaging findings and relevant clinical information were recorded. A thorough literature search was performed to find additional cases of this rare condition.
  
  
  RESULTS
  Three young patients presented with acute subperiosteal iliac hematoma following a fall. Clinical presentation was characterized by pain and gait disturbance presumed to result from crural nerve compression. Unilateral or bilateral lenticular hematomas deep in the iliacus muscle were demonstrated by CT for all patients while MRI was also available for two of them. In 16 asymptomatic patients, chronic ossified subperiosteal iliac hematomas were incidentally detected by CT. Progressive ossification of acute hematoma was demonstrated at follow-up in two patients.
  
  
  CONCLUSIONS
  Subperiosteal iliac hematoma is rare but has typical imaging findings that may present acutely in adolescents or chronically in asymptomatic adults.
authors.affiliation: Department of Musculoskeletal Imaging, Rennes University Hospital, 35203, Rennes Cedex 2, France. raphael.guillin@chu-rennes.fr
authors.forename: Raphaël
authors.initials: R
authors.lastname: Guillin
authors.forename: Thomas
authors.initials: T
authors.lastname: Moser
authors.forename: Meriam
authors.initials: M
authors.lastname: Koob
authors.forename: Viviane
authors.initials: V
authors.lastname: Khoury
authors.forename: Madeleine
authors.initials: M
authors.lastname: Chapuis
authors.forename: Mickaël
authors.initials: M
authors.lastname: Ropars
authors.forename: Etienne
authors.initials: E
authors.lastname: Cardinal
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D001847:Bone Diseases / Q000175:diagnosis*; D002648:Child; D005260:Female; D006406:Hematoma / Q000175:diagnosis*; D006801:Humans; D007085:Ilium / Q000000981:diagnostic imaging* / Q000473:pathology*; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D014057:Tomography, X-Ray Computed; D055815:Young Adult