Baker's Cyst

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Baker's Cyst

Authors, Editors, Case Information Author: Kathy Vidlock, MD Affiliation: Rocky Vista University College of Osteopathic Medicine Co Author(s): none Senior Editor: Laura Mattson, DO Clinical Vignette: 62 year old female with atraumatic posterior knee swelling for a month. Exam normal except mild popliteal fossa swelling. Type of Probe Used: L 12-3 MHz #1 - Image This transverse image shows a large anechoic area of fluid between the medial head of the gastrocnemius and the semimembranous tendon. #2 - Image This is a labeled transverse image shows a large anechoic area of fluid between the medial head of the gastrocnemius and the semimembranous tendon. #3 - Image This image shows aspiration of the cyst done with an in plane approach. Interpretation Image Interpretation: In the transverse view, there is a Bakers cyst present between the semimembranousus and medial gastrocnemius tendons. Teaching Pearl: Bakers cysts are common findings and arise between the distal semimembranosus and proximal medial gastrocnemius tendons, representing leakage of fluid from the joint space via a valvular opening of the posterior joint capsule. These may be left alone or aspirated depending on the clinical scenario. Recurrence is common especially if the patient has significant intraarticular pathology such as arthritis or meniscal injury. Bakers cysts may rupture with spread of fluid which can mimic signs and symptoms of DVT. If large enough, Bakers cysts may compress surrounding structures including peroneal nerve, popliteal artery and tendons though this is rare.
NOTE: For more information, please contact the AMSSM, 4000 W. 114th Street, Suite 100, Leawood, KS 66211 (913) 327-1415.

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Authors, Editors, Case Information

#1 - Image

#2 - Image

#3 - Image

Interpretation

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