Pilomatricomas: the diagnostic value of ultrasound.
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.
Choo
Hye Jung
HJ
Department of Diagnostic Radiology, College of Medicine, Inje University Pusan Paik Hospital, Busan, Korea, 614-735.
Lee
Sun Joo
SJ
Lee
Young Hwan
YH
Lee
Jae Hyuk
JH
Oh
Minkyung
M
Kim
Myung Hee
MH
Lee
Eun Joo
EJ
Song
Jong Woon
JW
Kim
Sook Jung
SJ
Kim
Dong Wook
DW
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