Today’s Word of the day is Baker Cyst or popliteal cyst is commonly seen in patients over 50 years of age and occurs when there is a distention of the semimembranosus-medial gastrocnemius bursa. Baker cyst occurs due to local irritation or inflammation, but most often is associated with fluid accumulation through communication with the knee joint.
A Baker cyst can have a variety of ultrasound characteristics ranging from anechoic to more complex fluid representing hemorrhage or synovial hypertrophy. Accurate diagnosis of a Baker cyst requires identification of the channel between the semimembranosus and the medial head of the gastrocnemious tendon, which connects the bursa to the knee joint via the subgastrocneumius bursa. This appears as a C-shaped fluid collection that wraps around the medial head of the gastrocnemius tendon and muscle.