Classic history and presentation: Popliteal cysts typically present as pain localized to the back of the knee with a sensation of stiffness and possible knee swelling. Weakness or claudication (secondary to neurovascular impingement) may be present.
- Age – This can occur in all ages, but it is most common in older adults.
- Adults tend to have secondary Baker cysts.
- Pediatric popliteal cysts are usually primary, spontaneous, and self-resolving. They most commonly occur due to herniation of the posterior knee joint capsule synovium and are rarely due to injury. They are often asymptomatic, and they do not communicate with the joint space.
- Consider secondary pediatric Baker cysts if there is a history of juvenile idiopathic arthritis (JIA) or Lyme disease.
- Studies of asymptomatic knees have shown the prevalence of popliteal cysts to be anywhere from 4.7%-37%.They are often found incidentally on imaging.
- Sex / gender – No prevalence.
M71.20 – Synovial cyst of popliteal space [Baker], unspecified knee
240008008 – Synovial cyst of knee
- Synovial cell sarcoma
- Popliteal artery aneurysm
- Deep venous thrombosis
- Arteriovenous malformation
- Pigmented villonodular synovitis
- Adventitial cyst of artery
- Xanthoma (see, eg, tendinous xanthoma, tuberous xanthoma)
- Pes anserine bursitis
- Cruciate ligament cyst
- Meniscus tear