Image IQ: 11-year old Female with Bilateral Knee Swelling

Poll

An 11-year-old female presents with persistent chronic swelling of the right greater than left knees and stiffness limiting mobility.

An 11-year-old female presents with persistent chronic swelling of the right greater than left knees and stiffness limiting mobility. Knee radiographs are unremarkable. Representative images from bilateral knee MRI were obtained.

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What's your diagnosis?

Amyloid
Synovial chondromatosis
Pigmented villonodular synovitis
Synovial hemangioma

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