0 a tumour (= a mass of diseased cells) that is formed of tissues that are not normally present where the tumour is found --
Teratoma qualifies as a rare disease, but is not extremely rare.
Among these, a common form is teratoma with endodermal sinus tumor.
It can also cause an anterior meningocele or a presacral teratoma.
A large minority of patients with a mediastinal teratoma (including dermoid cyst) will cough up hair.
It is not a teratoma, however, which is a neoplasm comprising all three germ cell layers (ectoderm, endoderm, mesoderm).
Apart from teratomas, to a large extent cancer is a disease caused by chemical and physical agents in our environment.
Adult stem cells also do not suffer from potential complications such as teratoma (tumour) formation.
The development of teratomas from parthenogenetically activated ovarian mouse eggs.
