pilomatricoma
Pronunciation: pie-low-ma-tri-KO-ma
A benign hair follicle tumor presenting as a firm, calcified nodule, most commonly occurring in children and young adults.
Full Definition
Pilomatricoma is a benign tumor arising from hair matrix cells, typically presenting as a solitary, firm, subcutaneous nodule with overlying normal skin. These lesions are most common in the first two decades of life and frequently occur on the head, neck, and upper extremities. The tumor often feels rock-hard due to calcification and may show the characteristic 'tent sign' when the overlying skin is stretched. While benign, surgical excision is the treatment of choice to prevent complications and confirm the diagnosis.
Usage
Usage note: Document the tent sign when present as it supports the clinical diagnosis.
In Context
- "The pilomatricoma on the child's forehead demonstrated the classic tent sign on examination." — Clinical examination note
- "Histopathology confirmed the diagnosis of pilomatricoma with characteristic ghost cells and calcification." — Pathology report