Malignant germ cell tumor is a rare form of cancer characterized by abnormal cell growth of immature cells that develop into male and female reproductive systems. Individuals with this disorder may grow harmful tumors in the ovaries, testes, abdomen, pelvis or lower back, which can spread to the rest of the body if not diagnosed and treated early. This form of cancer can thus cause individuals to lose reproductive ability. Common symptoms include weight loss, abdominal pain and breathing problems. An individual may also feel a mass or growth in their abdomen. Diagnosis may require blood tests and imaging studies such as a CT scan. A physician may also need to take a biopsy, which is where they surgically remove a small portion of the tumor to look at under a microscope. Treatment is developed on a case-by-case basis and may include a combination of chemotherapy, radiation, and surgery.