title: Head and neck lipomas: sonographic appearance.
abstract: OBJECTIVE
  The diagnosis of cervical lipoma may not always be clinically apparent, in which case patients are frequently referred for sonography. The purpose of this study was to document the sonographic features of head and neck lipomas.
  
  
  METHODS
  Twenty-five patients with soft-tissue masses in the neck had sonography as their initial imaging study. A lipoma was suspected on the basis of findings at clinical examination in only eight of these patients. Lipoma was confirmed by fine-needle aspiration cytology in 11 patients, by excision biopsy in five patients, by CT in two patients, and by clinical examination with clinical sonographic follow-up (6 months to 2 years) in seven cases.
  
  
  RESULTS
  Lipomas were well-defined (88%), compressible (100%), elliptical masses with the longest diameter parallel to the skin surface. All contained multiple echogenic lines parallel to the skin surface with no evidence of posterior enhancement or attenuation and no flow on color Doppler sonography. Compared with adjacent muscle, 76% of all lipomas were hyperechoic, 8% isoechoic, and 16% hypoechoic.
  
  
  CONCLUSIONS
  The characteristic sonographic appearance of head and neck lipomas is that of an elliptical mass parallel to the skin surface that is hyperechoic relative to adjacent muscle and that contains linear echogenic lines at right angles to the ultrasound beam.
authors.affiliation: Department of Diagnostic Radiology and Organ Imaging, Prince of Wales Hospital, Shatin NT, Hong Kong.
authors.forename: A T
authors.initials: AT
authors.lastname: Ahuja
authors.forename: A D
authors.initials: AD
authors.lastname: King
authors.forename: J
authors.initials: J
authors.lastname: Kew
authors.forename: W
authors.initials: W
authors.lastname: King
authors.forename: C
authors.initials: C
authors.lastname: Metreweli
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D003937:Diagnosis, Differential; D005260:Female; D006258:Head and Neck Neoplasms / Q000000981:diagnostic imaging*; D006801:Humans; D008067:Lipoma / Q000000981:diagnostic imaging*; D008297:Male; D008875:Middle Aged; D014463:Ultrasonography