Pathology of Pilar Sheath
Pilar sheath acanthoma is a
rare, benign follicular hamartoma described first in 1978 by Mehregan
Clinical presentation: Clinically resembles a comedo and is characterized by a central pore - like opening plugged with keratin.
Lesion is 5-10mm in diameter.
Site: Solitary lesion occuring almost always on the upper lip.
Cases have been reported on other areas of the head and face.
1. Dilated pore (small finger-like projections extending into the dermis) ;
2. Trichofolliculoma (secondary hair follicles radiate from the wall of the primary follicle, an outer root sheath, inner root sheath and trichohyaline granules are noted in the secondary follicles) ;
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