Teratoma is a tumor caused by the individual development of germ cells. Symptoms include chest pain, cough, fatigue, and shortness of breath. Treatment may involve chemotherapy or surgery to remove the tumor, especially if there is a risk of recurrence. One example described a 4-month-old kitten that presented with a large mass involving its left ear area and temple. Surgical resection was performed to remove the tumor. There is no prevention for teratoma since its cause cannot be avoided.