Intramuscular Lipoma

Comments:
Intramuscular lipomas present as slow-growing, painless masses involving the large muscles of the thigh, shoulder and upper arm in adults. When the involved muscle contracts, they become more apparent as a spherical mass. They are uncommon in children and difficult to distinguish from diffuse lipomatosis and lipoblastomatosis in that age group. The image shows mature fat cells diffusely infiltrating skeletal muscle.