Podcast
Questions and Answers
Chondroblastomas typically arise centrally in the calcaneus and are associated with thick sclerotic margins.
Chondroblastomas typically arise centrally in the calcaneus and are associated with thick sclerotic margins.
False (B)
A unicameral bone cyst can have a multiloculated appearance and is characterized by the absence of calcification within the lesion.
A unicameral bone cyst can have a multiloculated appearance and is characterized by the absence of calcification within the lesion.
True (A)
The presence of a fallen fragment sign indicates calcification within an intraosseous lipoma.
The presence of a fallen fragment sign indicates calcification within an intraosseous lipoma.
False (B)
Geodes are subchondral cysts associated with osteoarthritis that typically do not communicate with the joint space.
Geodes are subchondral cysts associated with osteoarthritis that typically do not communicate with the joint space.
Fat density on CT or MRI is a key feature that distinguishes an intraosseous lipoma from other bone lesions.
Fat density on CT or MRI is a key feature that distinguishes an intraosseous lipoma from other bone lesions.
Flashcards
Unicameral bone cyst
Unicameral bone cyst
A well-defined bone lesion with a thin sclerotic margin, potentially multiloculated. It lacks calcification, differentiating it from intraosseous lipoma. A "fallen fragment sign" can be seen if fractured.
Geode
Geode
A subchondral cyst associated with osteoarthritis. It communicates with the joint space and typically appears in older patients.
Chondroblastoma
Chondroblastoma
A benign bone tumor that typically arises in the epiphysis of the calcaneus. It appears lobulated with a thin sclerotic margin.
Pseudo-cyst of calcaneus
Pseudo-cyst of calcaneus
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Intraosseous lipoma
Intraosseous lipoma
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Study Notes
Calcaneal Lesions
- Calcaneus, like the patella, is an epiphyseal equivalent; epiphyseal lesions should be considered.
- Lesions often arise eccentrically within the epiphysis, are lobulated, and have a thin sclerotic margin.
Pseudo-Cyst of Calcaneus
- A variation of the normal trabecular pattern in the calcaneus' center.
- Has a non-distinct (not crisp) edge.
- Maintains thin trabeculae; a visible nutrient foramen is present.
Unicameral Bone Cyst
- Well-defined lesion with a thin sclerotic edge (margin); potentially multiloculated.
- Important: No calcification; distinguishes from intraosseous lipomas.
- If fractured, might show a "fallen fragment" sign.
Intraosseous Lipoma
- Key feature: Calcification centrally within the lesion. Distinguishes it from other lesions in plain radiographs.
- Fat density on CT/MRI scans is also a hallmark.
- Periosteal reaction is absent, even with an acute fracture.
Geode
- Subchondral cyst associated with osteoarthritis.
- Connects with the joint space.
- Usually occurs in older patients.
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