title: Perineural invasion by keratoacanthoma.
abstract: In 18 examples of keratoacanthoma, the proliferating squamous epithelium histologically invaded the perineural space. The invasion did not adversely affect the biologic behavior and the prognosis.
mesh_terms: D000328:Adult; D000368:Aged; D004423:Ear; D004848:Epithelium / Q000473:pathology; D005145:Face; D005260:Female; D006801:Humans; D007636:Keratoacanthoma / Q000473:pathology*; D008297:Male; D008875:Middle Aged; D009333:Neck; D009417:Nerve Tissue / Q000473:pathology*; D012867:Skin / Q000473:pathology*