What is a popliteal cyst
Published April 18, 2024 | 
A popliteal cyst, also known as a Baker’s cyst, is due to a collection of fluid from the knee joint (synovial fluid) in a thin, membranous sac behind the knee. It is not related to a blood clot.
It usually appears as a swelling that may increase with standing and cause discomfort behind the knee and into the upper calf, especially when the knee is flexed.