Ovarian teratoma is a type of tumor that forms in the ovaries, often containing various types of tissue such as hair, muscle, and even teeth. These tumors can be classified as mature or immature, with mature teratomas being more common and usually benign, while immature teratomas may be malignant and require more aggressive treatment. Most ovarian teratomas occur in women of reproductive age and can cause symptoms like abdominal pain or swelling. Diagnosis typically involves imaging tests like ultrasound or CT scans, and treatment often includes surgical removal of the tumor. Regular monitoring may be necessary to ensure no recurrence.