History: 2595ml Long standing slowly growing plaque on the sole of one foot. Biopsy of leading edge. DD Connective tissue nevus ? related to incontinentia pigmenti or Proteus syndrome.

Description: Fibromatosis

Comments: Sections show a biopsy of skin in which there is a quite cellular fibrous proliferation extending through the full thickness of the dermis and reaching the upper dermis. This proliferation consists of relatively bland fibroblasts. There are moderate amounts of collagen deposition between the fibroblasts. The features present are those of fibromatosis.