Pilomatricoma

Pilomatricoma
Other namesCalcifying epithelioma of Malherbe, Malherbe calcifying epithelioma, and Pilomatrixoma
Histopathology of pilomatricoma, high magnification, H&E stain, showing the characteristic components of basaloid cells and ghost cells.
SpecialtyOncology 

Pilomatricoma is a benign skin tumor derived from the hair matrix. These neoplasms are relatively uncommon and typically occur on the scalp, face, and upper extremities. Clinically, pilomatricomas present as a subcutaneous nodule or cyst with unremarkable overlying epidermis that can range in size from 0.5 to 3.0 cm, but the largest reported case was 24 cm.