Baker's cyst (fluid sac behind knee)
About Baker's cyst (fluid sac behind knee)
A pocket of fluid that forms a lump behind the knee. It is also called a popliteal cyst. The fluid can extend down the leg and cause leg swelling and be mistaken for a deep vein blood clot of the leg.Symptoms
Pain, knee swelling, calf swelling.Tests & Diagnostics
A history and physical exam will be performed. This condition is typically diagnosed with an ultrasound, but also can be identified with a CT scan or MRI.Common tests: CT Scan, MRI, Ultrasound.
OTC sleep aids and supportive treatments
Prescription medications
Conventional treatment summary
Observation, needle drainage, repair of knee damage that is causing the cyst if such a problem is coexisting (meniscal tear, arthritis). Pain relief can be obtained with nonsteroidal anti-inflammatory medications/NSAIDs (ibuprofen/Motrin or Advil, naproxen/Naprosyn or Aleve), and/or acetaminophen (Tylenol).Medical specialties
Orthopedic Surgery · Pediatric Sports Medicine
This page is educational content, not medical advice. Always consult a qualified clinician for diagnosis and treatment of Baker's cyst (fluid sac behind knee).