Trichoepithelioma and pigmented nevus. A combined malformation

The occasional occurrences of combined hamartomas composed of nevus cell nevi and adnexal tumors are not chance happenings. Pigmented nevi are malformations consisting of nevus cells together with various connective tissue and epithelial components. The proliferation of these components results in the combined malformations, whose occurrence, we believe, is more supporting evidence for the idea that pigmented nevi may have other components besides nevus cells.