Just got home from doctor. she said i have baker's cyst. looked it up online and now more confused that ever. can you explain what it means to have it?

Behind knee joint: A baker's cyst is also known as a popliteal cyst. It often develops behind the knee joint when there is some other problem within the knee joint. Arthritis or a cartilage tear (meniscus tear) are the most common problems associated with a baker's cyst. The key is to treat the problem in the joint and not focus on the cyst. If swelling within the joint is reduced, then the cyst often disappears.

Let me explain: A baker's cyst is a pocket of fluid that forms a lump behind the knee. It is also called a popliteal cyst.