Diffuse neurofibroma of the scalp presenting as circumscribed alopecic patch.

Neurofibroma is a benign tumor of the peripheral nerve sheath characterized by proliferation of Schwann cells, perineural cells and endoneurial fibroblasts. Different types of neurofibromas can be identified, including localized, plexiform, and diffuse types. Diffuse neurofibroma is an uncommon form of neurofibroma that occurs primarily in children and young adults. The head and neck regions are the most common sites of involvement. Diffuse neurofibroma is an ill-defined infiltrative lesion and tends to involve the skin and subcutaneous tissues. It produces localized thickening and induration of the skin. We present a case of a 12-year-old boy who had a diffuse neurofibroma on the scalp since the age of 2 years.