Childhood extracranial germ cell tumor is a rare cancer found in the reproductive organs (testicles in males, ovaries in females), that travel to other parts of the body other than the brain (e.g. chest, abdomen, or tailbone). The cause of most childhood extracranial germ cell tumors is unknown, but certain genetic disorders, such as Klinefelter syndrome or Swyer syndrome, or undescended tesciles can be risk factors. Symptoms of childhood extracranial germ cell tumors depends on the type of tumor and where it is in the body. Other conditions can cause similar symptoms. You should check with a doctor if your child has a visible lump in the testicles or abdomen, especially with fever, constipation, or unusual vaginal bleeding. Treatment and prognosis also depends on the type of germ cell tumor, where the tumor began to grow, the stage of cancer, the patient’s age and general health, and whether the cancer has just been diagnosed or has come back. Treatment options include chemotherapy, surgery, or watchful waiting.