Section Editor: Sandy Cheng-Yu Chen, M.D.
Taipei Medical University Hospital, Taipei, Taiwan
Figure Caption
Pilomatricoma is a rare benign subcutaneous neoplasm of children and young adults, arising from hair cortical cells and most commonly located within the head and neck. The frequently calcified tumor consists of basophilic epithelial cells in the periphery and shadow cells with lost nuclei in the tumor center. Clinically, patients often present with a firm, bluish skin mass mimicking hemangioma. The classic MRI features of pilomatricoma can be differentiated from hemangioma by observing heterogeneous intermediate signal intensity on T2-weighted images (A), intermediate-to-low signal intensity on T1-weighted images (B), and peripheral enhancement on postcontrast T1-weighted images (C).