Myofibromatosis, Infantile, 1, also known as congenital generalized fibromatosis, is related to fibromatosis and peroxisome biogenesis disorder 5a. An important gene associated with Myofibromatosis, Infantile, 1 is PDGFRB (Platelet Derived Growth Factor Receptor Beta). Affiliated tissues include skin and skeletal muscle, and related phenotypes are fibroma and myofibromatosis