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.
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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.
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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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Description
Explore the various types of calcaneal lesions including pseudo-cysts, unicameral bone cysts, intraosseous lipomas, and geodes. Understanding their characteristics will aid in diagnosis and differentiate between these conditions. This quiz covers essential features and imaging findings related to calcaneal lesions.
