Podcast
Questions and Answers
Myositis ossificans typically occurs in older, sedentary individuals.
Myositis ossificans typically occurs in older, sedentary individuals.
False (B)
A key feature of myositis ossificans is the erosion of the underlying cortex of the bone.
A key feature of myositis ossificans is the erosion of the underlying cortex of the bone.
False (B)
Myositis ossificans can be identified by the presence of a mass of calcified soft tissue.
Myositis ossificans can be identified by the presence of a mass of calcified soft tissue.
True (A)
The string sign in myositis ossificans indicates a complete separation of the mass from the bone.
The string sign in myositis ossificans indicates a complete separation of the mass from the bone.
Myositis ossificans and parosteal osteosarcoma both exhibit the string sign.
Myositis ossificans and parosteal osteosarcoma both exhibit the string sign.
Flashcards
Myositis ossificans
Myositis ossificans
A condition where bone forms within muscle tissue after a muscle injury, usually occurring in young, active individuals.
Muscle haemorrhage and necrosis
Muscle haemorrhage and necrosis
Bleeding and tissue death in a muscle due to injury.
Calcification
Calcification
The process of calcium deposits forming in a tissue, often as a result of injury.
String sign
String sign
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Malignant fibrous histiocytoma
Malignant fibrous histiocytoma
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Study Notes
Myositis Ossificans
- Trauma leads to muscle haemorrhage and necrosis.
- Calcification results from this damage, persisting sometimes long-term.
- Large muscles are more susceptible.
- Typically affects young, active adolescents.
- Presents as a calcified soft tissue mass near the injury.
- May or may not show a periosteal reaction.
- Crucial distinction: No underlying cortical erosion, unlike malignant fibrous histiocytoma.
- "String sign" indicates a plane of normal tissue completely separating the mass from the bone.
- This distinguishes it from parosteal osteosarcoma, where the plane isn't always continuous.
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