Ruptured ovarian cysts happen when these fluid-filled sacs in the ovaries break. The ovarian cyst wall opens up, which exposes the fluid in the cyst to your abdominal cavity. Physical activity or ...

What is a cystic hygroma? A cystic hygroma — or lymphangioma — is a birth defect that appears as a sac-like structure with a thin wall that most commonly occurs in the head and neck area of an infant.