Pediatric Pilomatricoma

  • Etiology: Benign tumor arising from hair follicles
  • Imaging US:
    — Well-circumscribed oval mass at junction of dermis and epidermis
    — Hypoechoic rim
    — Variable internal calcification (punctate to completely calcified with posterior shadowing)
    — Often has internal vascularity
  • DDX:
  • Complications:
  • Treatment: Surgical
  • Clinical: Mobile, non-tender, well-circumscribed, slow-growing mass

Radiology Cases of Pilomatricoma

Radiograph and US of pilomatricoma
AP radiograph of the forearm (left) shows a round faintly calcified lesion lateral to the diaphysis of the radius. Transverse (above right) and sagittal (below right) US images of the lesion show it to be in the subcutaneous tissues and to have a heterogenous speckled appearance.
CT of pediatric pilomatricoma
Axial (above) and coronal (below) CT with contrast of the face show a well-circumscribed oval lesion near the left ear that has calcifications within it. There are no inflammatory changes associated with it.