title: Proliferating pilar cyst with spindle cell component.
abstract: Proliferating pilar cysts are rare tumors which occur most commonly on the scalp of elderly women. The infiltrative areas of these tumors should be differentiated from epidermoid carcinoma because they are usually benign. The intimate association of this entity with a spindle cell component is described here, to our knowledge for the first time.
mesh_terms: D000368:Aged; D002294:Carcinoma, Squamous Cell / Q000175:diagnosis / Q000473:pathology; D003937:Diagnosis, Differential; D004814:Epidermal Cyst / Q000175:diagnosis / Q000473:pathology; D005260:Female; D006801:Humans; D012535:Scalp / Q000473:pathology; D012867:Skin / Q000473:pathology; D012878:Skin Neoplasms / Q000175:diagnosis / Q000473:pathology