- Dorsal defect of patella: Normal variant
- Subchondral cyst: Can be seen with osteoarthritis or pyrophosphate arthropathy.
- Amyloid deposition: In patients with renal disease.
- Chondroblastoma: Most common benign neoplasm of the patella. Round or lobulated with a well-defined sclerotic rim.
- Giant cell tumor: Geographical pattern of bone destruction. Involve more than 3/4 of the patella and lead to cortical thinning and septations. Locally aggressive
- Pigmented villonodular synovitis:
- Unicameral bone cyst:
- Aneurysmal bone cyst:
- Metastasis:
- Malignant tumor: Hemangioendothelioma, lymphoma, and osteosarcoma.
- Gout: Rare. Soft tissue component may be seen on MRI. Has a predilection for the superolateral aspect of the patella.
- Osteomyelitis: Rare. More common in adolescents (peak vascularity of the patella) or immunocompromised patients. No periosteal reaction (since sesamoids don't have a periosteal layer).
Thursday, November 11, 2010
Lucent Lesions of the Patella
Differential considerations for lucent lesions of the patella include:
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