Mucinous cysts are fluid-filled sacs that typically develop in the ovaries or pancreas. They are characterized by a thick, gel-like fluid called mucin. These cysts can vary in size and may be benign or, in some cases, potentially malignant. Diagnosis often involves imaging techniques such as ultrasound or CT scans. Treatment options depend on the cyst's size and symptoms, ranging from monitoring to surgical removal if necessary. Regular follow-up is important to ensure that any changes in the cyst are detected early.