Last updated on: December 4th, 2021

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You’re looking at an interactive case study from Prognosis: Your Diagnosis (one of four distinct learning formats available in Clinical Odyssey). Try it out, and have fun improving your clinical skills.



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A 82 year old man presents with pain and swelling of his right knee for 1 year, resulting in difficulty in walking. He also noticed a mass in the same knee 6 months ago, which has gradually increased in size over time.

He was diagnosed with type 2 diabetes mellitus 10 years ago, which is currently well controlled. An HbA1C last month was 5.5%. His surgical and family histories are unremarkable.

He does not smoke or use recreational drugs, but drinks socially.

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