Baker's cyst
Brief definition
A Baker's cyst (also called a popliteal cyst) is a fluid-filled pouch that bulges out of the knee joint capsule into the back of the knee. It forms when the joint makes more fluid than it should and that fluid pushes backward through a weak spot in the capsule. It turns up all the time as an incidental finding on knee MRI.
What is behind this finding?
A Baker's cyst is almost always a symptom of another knee problem — not the problem itself. The report gives its size (“Baker's cyst 3 × 2 cm”), where it sits and sometimes how it connects to the joint. The usual culprits behind it are osteoarthritis, a meniscus tear, cartilage damage or an inflammatory joint disease. Occasionally a Baker's cyst ruptures and the fluid spills down into the calf, which can look and feel exactly like a blood clot in the leg.
What does this mean for you?
Most Baker's cysts cause nothing worse than a sense of pressure or tightness behind the knee, and they need no treatment of their own. Treatment goes after the cause instead: get the underlying knee problem under control — osteoarthritis, for example — and the cyst often shrinks by itself. Draining the cyst or removing it surgically is reserved for cysts that are very large and genuinely painful, and even then they frequently come back. If your Baker's cyst suddenly turns painful and your calf swells, get it looked at the same day, because a blood clot has to be ruled out.
When is a second opinion worthwhile?
For a Baker's cyst on its own, you probably do not need a radiological second opinion: the finding is rarely in doubt, and the treatment follows the cause rather than the cyst. It is a different story when the knee MRI lists several findings at once and no one can tell you which of them is actually causing your pain. At Second View, a board-certified radiologist licensed in Germany reviews your images independently and writes up what they see in plain language, usually within 48 hours.
How can I request a second opinion?
1. Get in touch
Contact us through our platform.
2. A radiologist gets back to you
A board-certified radiologist contacts you personally and works with you to pin down exactly which question the second opinion should answer — and whether your existing images (MRI, CT, or X-ray) are suitable for a second read.
3. Transparent, upfront pricing
You then receive a firm quote — usually €70–150, depending on the type of exam.
4. The second reading
Once you approve and pay, our radiologists — all licensed to practice in Germany — review your images carefully and independently.
5. Your report & follow-up questions
Your report arrives digitally, written in plain, easy-to-understand language.
If anything is unclear, you can speak directly with the radiologist who read your images.
Tip:
Many private health insurers reimburse some or all of the cost of a radiological second opinion.
You’ll receive an invoice you can submit to your insurer. If you have German statutory health insurance (GKV), you currently pay for the second opinion yourself — statutory insurance does not cover it (Section 27b of the German Social Code, Book V).