Giant fibromyxoid tumors of the adventitial dermis. Forme fruste of trichodiscoma?

Overview

A 36-year-old paraplegic man developed multiple giant fibromyxoid tumors surrounding a meningomyelocele scar that we believe are forme fruste of trichodiscomas. Histologic examination showed a papillated, slightly hyperplastic epidermis surrounding a delicate fibrovascular proliferation set in a stroma of loose fibrillar connective tissue and stellate fibroblasts. A melanocytic nevus was incorporated into one of the lesions. We believe that these giant lesions are connective tissue nevi of the adventitial dermis that comprise a new clinical variant of trichodiscoma. The potential significance of the relationship between these abortive trichodiscomas and abnormalities of the neural crest is discussed.