Fibromatosis

Fibromatosis is a tumor derived from fibrous tissue. The incidence was 1.37% of benign soft tissue tumors. Tumors can occur in large muscles in any part of the body. The rectus abdominis and its adjacent muscles, the aponeurosis, are the most common. They occur in pregnancy and late pregnancy. Those outside the abdominal wall are more common in men, and are more common in the scapula, thighs and hips. The age of onset is mostly 30 to 50 years old, and children and adolescents are not uncommon. The cause of this disease is unknown, and may be related to trauma, hormones and genetic factors.