Trichilemmal cyst
http://purl.obolibrary.org/obo/HP_0025246
Term info
comment
Epidermal cysts and trichilemmal cysts are clinically indistinguishable. The wall of the epidermal cyst conserves the epidermal layers, but the wall of the trichilemmal cysts, which arise from the external root sheath, shows palisading of unlayered epithelial cells. Homogeneous horny material that is further degraded to fat and cholesterol forms within both types of cysts.
created by
HPO:probinson
date
2016-12-17T13:45:04Z
definition
Nontender, round and firm, but slightly compressible, intradermal or subcutaneous cyst measuring 0.5-5 cm in diameter. Trichilemmal cysts are acquired rather than congenital, and tend to appear on the scalp rather than the face, and to be intradermal rather than subcutaneous.
has exact synonym
Pilar cyst