label: Adult Fibrosarcoma
label_lc: adult fibrosarcoma
description: A malignant mesenchymal neoplasm composed of fibroblasts.  It is characterized by collagen production and a herringbone architectural pattern.  It is more commonly seen in middle-aged and older adults.  It usually affects the deep soft tissues of extremities, trunk, head and neck.  Adult fibrosarcomas may recur and metastasize to the lungs and bones.