A 52 years old female with a nail lesion for several months.

    A 52 years old woman presented dark brown localized thickening of nail plate and the thickening extends to the lateral side of nail for several months. No significant past medical history is noted.

    Pathological findings: The tumor showed multiple fibroepithelial projections lined by stratified squamous epithelium, which was identical to those of normal matrix epithelium and keratinized with no granular layer.