Pilot study

A two-way valve designed to control the pressure in an endotracheal tube cuff as introduced through a pilot balloon.

A hamartoma characterized by localized pilosebaceous apparatus malformation.

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…