A 42-year-old man visited his doctor with a complaint of pain and swelling on his left knee for the past two months. He reported no recent falls or injuries. He had spent the past several months laying new tile flooring as part of a home improvement project, and he wondered if the extra impact on his knees could have contributed to the onset of symptoms. His medical history was unremarkable except for gout. On examination, erythema and swelling were seen over the left knee. Radiologic exam showed soft tissue swelling and hemorrhagic fluid collection in the prepatellar area.
Is it osteochondritis dissecans of the knee, lateral patellar compression syndrome, osteoarthritis of knee, or prepatellar bursitis?
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