title: Ultrasound appearance of scrotal fat necrosis in prepubertal boys.
abstract: BACKGROUND
  Scrotal fat necrosis is a rare cause of scrotal pain in prepubertal boys. Despite its characteristic clinical presentation, it is an under-recognized entity. Specific scrotal US imaging features of this condition have not been previously reported.
  
  
  OBJECTIVE
  To describe the US imaging features of scrotal fat necrosis.
  
  
  METHODS
  Between January 1999 and November 2006 we identified all boys with idiopathic scrotal fat necrosis presenting for ultrasound imaging. All the children were reviewed by the urology service during the initial presentation and assessment with clinical confirmation of the diagnosis of scrotal fat necrosis. The sonographic appearances in each child were reviewed.
  
  
  RESULTS
  Over the course of 6 years we identified ten children who had the classic clinical diagnosis of idiopathic scrotal fat necrosis. The scrotal fat was characteristically hyperechoic, with posterior shadowing. This was located inferior to the testes which were displaced superiorly. The testes and epididymi were normal in all children.
  
  
  CONCLUSIONS
  There are specific imaging features of scrotal fat necrosis that when combined with the characteristic clinical presentation can confirm the diagnosis of scrotal fat necrosis.
authors.affiliation: Department of Radiology, Dunedin Public Hospital, 201 Great King St, Dunedin, New Zealand. gregh@healthotago.co.nz
authors.forename: Gregory
authors.initials: G
authors.lastname: Harkness
authors.forename: Grant
authors.initials: G
authors.lastname: Meikle
authors.forename: Susan
authors.initials: S
authors.lastname: Craw
authors.forename: Kampta
authors.initials: K
authors.lastname: Samalia
mesh_terms: D002648:Child; D004822:Epididymis / Q000000981:diagnostic imaging; D005218:Fat Necrosis / Q000000981:diagnostic imaging*; D005500:Follow-Up Studies; D005538:Football; D005832:Genital Diseases, Male / Q000000981:diagnostic imaging*; D006801:Humans; D008297:Male; D010146:Pain / Q000000981:diagnostic imaging; D011627:Puberty; D012189:Retrospective Studies; D012611:Scrotum / Q000000981:diagnostic imaging*; D013550:Swimming; D013737:Testis / Q000000981:diagnostic imaging; D018608:Ultrasonography, Doppler