| Type | MGI:General | Description | 9% of young mutants aged 6-13 weeks exhibit rhabdomyosarcoma on a CD-1 background incidence of rhabdomyosarcoma is lower on the C57BL/6 background than on the CD-1 background, with only 1 of 53 showing this phenotype tumors generally involve the skeletal muscle of the rear thigh, lumbar region or abdominal wall tumors are unencapsulated and neoplastic cells invade the adjacent muscle and fat |
