Perineural invasion by SCC.
D002294:Carcinoma, Squamous Cell / Q000473:pathology*; D006258:Head and Neck Neoplasms / Q000473:pathology*; D006801:Humans; D009361:Neoplasm Invasiveness; D010524:Peripheral Nervous System Neoplasms / Q000473:pathology*; D012878:Skin Neoplasms / Q000473:pathology*