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Board question of the day 4


4. A 62-year-old woman with a ten-year history of rheumatoid arthritis presents with painful swelling at the back of the knee that is visible on physical examination only when the knee is extended. Which of the following is the most likely diagnosis?

A) Anserine bursitis
B) Baker’s cyst
C) Deep venous thrombosis
D) Prepatellar bursitis
E) Infrapatellar bursitis


Correct Answer B. Baker’s Cyst
A Baker’s cyst occurs in the midline of the popliteal fossa and is often a complication of rheumatoid arthritis. The cyst represents a diverticulum of the synovial sac that protrudes through the joint capsule of the knee. The knee is composed of 12 different bursae.

Educational Objectives
A Baker’s cyst, also called a popliteal cyst, is usually the result of a problem with your knee joint, such as arthritis or a cartilage tear. Both conditions can cause your knee to produce too much fluid, which can lead to a Baker’s cyst.

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