A type of cancer that forms in fibrous (connective) tissue.
Congenital fibrosarcoma usually occurs in infants and young children but it may also be found before birth by ultrasound. It can occur anywhere in the body. The tumor is often large and fast-growing, but it rarely spreads to other parts of the body. The cancer cells usually have a certain genetic change called a translocation (part of one chromosome switches places with part of another chromosome). Congenital fibrosarcoma is a type of soft tissue sarcoma. Also called infantile fibrosarcoma.