title: Pilomatricomas: the diagnostic value of ultrasound.
abstract: OBJECTIVE
  The purpose of this study was to analyze statistically significant diagnostic factors for pilomatricoma on the basis of ultrasonographic features.
  
  
  METHODS
  Sonographic images were retrospectively reviewed from 44 pilomatricomas, and from 43 control subjects with other subcutaneous tumors. Two radiologists determined the tumoral shape, margin, echotexture, echogenicity, posterior shadowing, posterior enhancement, hypoechoic rim, internal calcification, and vascularity.
  
  
  RESULTS
  The reliable diagnostic factors for pilomatricoma were hypoechogenicity (P < 0.001), heterogenicity (P < 0.05), internal calcification (P < 0.001), hypoechoic rim (P < 0.001), and posterior shadowing (P < 0.001). Scattered dots were the most common patterns of internal calcification. A combination of hypoechogenicity, heterogenicity, internal calcification of scattered-dot pattern, and a hypoechoic rim was a statistically significant difference between the two groups (P < 0.001; odds ratio, 21).
  
  
  CONCLUSIONS
  The features of heterogeneous echotexture, internal echogenic foci in scattered-dot pattern, and a hypoechoic rim or posterior shadowing itself could be discriminative ultrasonographic criteria for differentiating pilomatricomas from other subcutaneous tumors.
authors.affiliation: Department of Diagnostic Radiology, College of Medicine, Inje University Pusan Paik Hospital, Busan, Korea, 614-735.
authors.forename: Hye Jung
authors.initials: HJ
authors.lastname: Choo
authors.forename: Sun Joo
authors.initials: SJ
authors.lastname: Lee
authors.forename: Young Hwan
authors.initials: YH
authors.lastname: Lee
authors.forename: Jae Hyuk
authors.initials: JH
authors.lastname: Lee
authors.forename: Minkyung
authors.initials: M
authors.lastname: Oh
authors.forename: Myung Hee
authors.initials: MH
authors.lastname: Kim
authors.forename: Eun Joo
authors.initials: EJ
authors.lastname: Lee
authors.forename: Jong Woon
authors.initials: JW
authors.lastname: Song
authors.forename: Sook Jung
authors.initials: SJ
authors.lastname: Kim
authors.forename: Dong Wook
authors.initials: DW
authors.lastname: Kim
mesh_terms: D000293:Adolescent; D000328:Adult; D002648:Child; D002675:Child, Preschool; D005260:Female; D006201:Hair Diseases / Q000000981:diagnostic imaging*; D006801:Humans; D007223:Infant; D008297:Male; D008875:Middle Aged; D018296:Pilomatrixoma / Q000000981:diagnostic imaging*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D012878:Skin Neoplasms / Q000000981:diagnostic imaging*; D014463:Ultrasonography / Q000379:methods*; D055815:Young Adult