Called pseudocysts, these noncancerous (benign) pockets of fluids are lined with scar or inflammatory tissue, not the type of cells found in true cysts.

CNN: Pancreatic cysts

The expected course of ovarian cysts varies with a woman's age, the size of the cyst, whether there is a family history of ovarian cysts, and whether the cyst is fluid-filled, appears to be a solid mass of tissue, or has both fluid and solid components.

CNN: What are the potential problems with ovarian cysts?