Pilosebaceous Hamartoma

A hair-containing cyst or sinus, occurring chiefly in the coccygeal region.

A recently described astrocytic tumor of uncertain relation to pilocytic astrocytoma. It occurs predominantly in infants and young children. It…

Clonal proliferations arising from cutaneous hair follicles composed in part of cells with basaloid cytology that resemble human pilomatrixomas.

A benign adnexal neoplasm arising from hair-bearing skin surfaces, usually the head and neck and upper extremities. It usually presents as a…

A very rare, locally aggressive, malignant neoplasm of the hair follicle. The majority of the cases arise de novo, however malignant transformation…

A WHO grade I, relatively circumscribed, slowly growing, often cystic astrocytoma occurring in children and young adults. Histologically it is characterized…