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Most common mass in popliteal fossa
Incidence 10 to 58%
Intra-articular pathology results in flow of synovial fluid from the joint into the bursa, forming a cyst
Association with concomitant intra-articular disorders 94%
Possible pathology - Meniscus, ligamentous, arthritis, other osteochondral defects
In children this is not a pathologic finding
Symptoms - Posterior knee bulging, posterior tightness/stiffness esp. with knee flexion
Ultrasound - 100% sensitive/specific
DDx: DVT
Tx: Refer for ultrasound guided aspiration, fenestration and steroid injection
http://www.caringmedical.com/wp-content/uploads/2013/11/Bakers-Cyst-treatment.jpg
References
Smith, Lesniak et al. 2015 Treatment of popliteal cysts with ultrasound-guided aspiration, fenestration and injection: long term follw-up