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A Baker's cyst is a visible, fluid-filled lump which can form at the back of your child's knee. It happens when there is an extra build-up of fluid inside the bursa (small sac of fluid) between the calf and knee joint. Also known as popliteal cysts, they're quite common in boys between four to eight years old.
Usually, a child with a cyst will have no symptoms other than the visible lump at the back of their knee. This lump normally goes away on its own. In other cases, a Baker's cyst may lead to other symptoms, like:
Your GP or consultant will usually be able to make a diagnosis by discussing your child's symptoms and examining the cyst.
They will let you know if they need to carry out further tests to rule out other conditions. Additional tests might include an MRI or ultrasound scan.
If your child's cyst isn't causing any symptoms, treatment may not be necessary, as the cyst will often go away on its own. Your GP or consultant may recommend over-the-counter medicines or advise you on how to treat the cyst at home. Depending on the nature of your child's cyst, your GP or consultant may recommend draining the cyst or surgery (if the cyst has caused any significant damage around the knee).
This content is intended for general information only and does not replace the need for personal advice from a qualified health professional.