Collagenous fibroma

Collagenous fibroma, also known as desmoplastic fibroblastoma, is a slow-growing, deep-set, benign fibrous tumor, usually located in the deep subcutis, fascia, aponeurosis, or skeletal muscle of the extremities, limb girdles, or head and neck regions. The World Health Organization in 2020 reclassified desmoplastic fibroblastoma/collagenous fibroma as a specific benign tumor type within the broad category of fibroblastic and myofibroblastic tumors.