are the most common hair follicle tumor, typically measuring between 3-30 mm in diameter, and presenting on the head, neck or upper extremities.
In one of the largest reviews of head and neck pilomatricoma, out of 179 cases, only 8 cases (4.
Pilomatricoma typically presents as a superficial, solitary, slowly growing, rock-hard, painless nodular mass.
The pilomatricoma lesion appears as a sharply demarcated, calcified, subcutaneous nodule on computed tomography and as high-intensity signal bands in T2-weighted magnetic resonance imaging.
Fetil E, Soyal MC, Menderes A et al: Bullous appearance of pilomatricoma.
Yiqun J, Jianfang S: Pilomatricoma with a bullous appearance.
Inui S, Kanda R, Hata S: Pilomatricoma with a bullous appearance.
Pilomatricomas (also known as pilomatrixomas or calcifying epitheliomas of Malherbe) are benign tumors that arise from the hair matrix.
There is currently no method of imaging a pilomatricoma that produces a firm definitive diagnosis.
Computed tomography has also been used to investigate pilomatricomas.
Fetil E, Soyal MC, Menderes A, Lebe B, Gunes AT, Ozkan S: Bullous appearance of pilomatricoma.
Yoshimoto S, Ichinose M, Udagawa A, Matsumoto H, Shimizu S, Danino AM: Are multiple pilomatricomas rare?