Podcast
Questions and Answers
Myositis ossificans occurs exclusively in the elderly population.
Myositis ossificans occurs exclusively in the elderly population.
False
In myositis ossificans, erosion of the underlying cortex is a hallmark of the condition.
In myositis ossificans, erosion of the underlying cortex is a hallmark of the condition.
False
The string sign in myositis ossificans indicates a separation of the mass from the bone.
The string sign in myositis ossificans indicates a separation of the mass from the bone.
True
Myositis ossificans begins with well-defined calcification within a few days of injury.
Myositis ossificans begins with well-defined calcification within a few days of injury.
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Calcification in myositis ossificans occurs from the outer rim inwards over time.
Calcification in myositis ossificans occurs from the outer rim inwards over time.
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Study Notes
Myositis Ossificans: Overview
- Trauma causes local muscle hemorrhage and necrosis.
- This leads to long-term calcification.
- Large muscles in young, active adolescents are most susceptible.
- Appears as a calcified soft tissue mass.
- No erosion of underlying bone cortex, distinguishing it from malignant fibrous histiocytoma.
- A "string sign" – a normal tissue plane completely separating the mass from bone - is present. This is different from parosteal osteosarcoma since that mass doesn't have a whole plane separating it.
- Different appearances based on time after injury.
- Initially, amorphous calcification.
- Sharper cortical margins develop after ~2 months.
- Calcification progresses from the outer rim inwards.
- This contrasts with parosteal osteosarcoma, which shows central calcification and peripheral lucency.
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Description
Explore the key features of Myositis Ossificans, a condition resulting from trauma that leads to muscle hemorrhage and calcification. Understand the differences between its imaging appearance and that of other conditions such as malignant fibrous histiocytoma and parosteal osteosarcoma. This quiz will enhance your knowledge of this unique condition and its clinical implications.
