Titan came to the rescue as an owner surrender when he had to deploy overseas and his wife couldn't care for the dog. Titan came in with a tumor on his head had surgical removal of the tumor on November 10, 2016. A teratoma is an embryonic tumor (formed when the embryo was developing) which may be benign or malignant and in this case, luckily was benign. The tumor may contain hair, skin, nerve cells, bone, cartilage, fat, internal organ tissue, muscle and sometimes even teeth.