what is dermatofibrosarcoma protuberans
Dermatofibrosarcoma Protuberans (DFSP) is a rare type of cancer, a soft tissue sarcoma that develops in the deep layers of skin. It is sometimes described as having tentacles that can grow into surrounding fat, muscle and even bone. Bednar tumors (pigmented DFSP) contain dark-colored cells called melanin-containing dendritic cells. 2  Melanin is the substance that gives skin its color. 3  As a result, this type of tumor may contain various colors, including red and brown. 4  Bednar tumors account for approximately 1%-5% of all DFSP cases.