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Swelling Over Left Anterior Knee

Poll

For 2 months, a 29-year-old man had pain and circular, soft swelling (7 x 7 cm in diameter) over the anterior left knee, superficial to the patellar ligament. Your dx?

For 2 months, a 29-year-old man had pain and circular, soft swelling (7 x 7 cm in diameter) over the anterior left knee, superficial to the patellar ligament. Pain was minimal and associated with extension and flexion.

Your dx?

Rheumatoid arthritis
Prepatellar bursitis
Medial collateral and lateral collateral ligament injury
Osteoarthritis
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