Baker's (Popliteal) Cyst !
A Baker's cyst is a fluid-filled swelling at the back of the knee, usually connected to the knee joint.
Updated 2026-10-23
Structures involved
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Why it happens
What it is
Fluid-filled swelling in the popliteal fossa, usually communicating with the knee joint.
Symptoms and signs
- Fullness or a lump behind the knee
- Pain or tightness with full flexion
Diagnosis
- Clinical
- Palpable mass in the popliteal fossa
- Imaging
- Ultrasound or MRI
Treatment
- Conservative
- Treat the underlying knee condition.
Complications
- Rupture mimicking deep-vein thrombosis
Related conditions
Educational information, not medical advice. For any symptom, see a health professional.
Sources: Baker's Cyst (StatPearls (NCBI Bookshelf), 2024).
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