MICROSCOPIC DESCRIPTION:
The sections show fibrotic skeletal muscle, fragments of myxomatous loose fibrous tissue containing prominent blood vessels and fragments in which there is a haphazard arrangement of irregularly shaped trabeculae of woven bone. Many of these are rimmed by osteoblasta. The features are consistent with myositis ossificans circumscripta. No evidence of malignancy is seen.
FINAL DIAGNOSIS: Features consistent with myositis ossificans circumscripta; no evidence of tumour seen.