Isolated Nonsyndromic Intraneural Neuroma of the Eyelid Skin.

A 56-year-old man developed a 2 × 2 mm, yellow-orange painless, smooth-surfaced nodule in the middle third of his left upper eyelid. Microscopic evaluation disclosed a spindle cell tumor that was well circumscribed by a perineurium. The tumor cells manifested wavy, bland nuclei displaying comma-shaped and pointed ends. These cells were uniformly S100 positive. Immunohistochemical analysis further revealed an even dispersion of numerous dot-like neurofilaments diagnostic of an isolated intraneural neuroma. A neuroma differs from a schwannoma which fails to exhibit neurofilaments except in a peripherally located compressed nerve of origin. Simple excision is recommended.