Magnetic resonance imaging of a cystic pilomatricoma in an ankle joint
from Orthopedics Today
Pilomatricoma, also known as calcifying epithelioma of Malherbe, is an asymptomatic, slow-growing, benign dermal neoplasm that originates from hair cortex cells. The most common sites are the head and neck (68.2 percent), followed by the trunk (14.4 percent) and the upper (15.3 percent) and lower (2 percent) extremities. The majority (60–70 percent) of tumors develop in the first two decades of life. A typical pilomatricoma presents as a firm, calcified, dermal nodule appearing as a solid mass in subcutaneous tissue on computed tomography or magnetic resonance imaging.
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