I. Benign teratomas |
Mature teratoma |
Grade 0 - All component tissues appear well differentiated |
Grade 1 - Occasional microscopic foci contain incompletely differentiated tissues, not exceeding 10 percent of the sampled surface |
Immature teratoma, benign |
Grade 2 - Immature tissues make up between 10 and 50 percent of the sampled tumor surface |
Grade 3 - Over half of the surface examined is composed of undifferentiated tissues of uncertain metastatic potential; a benign course is still possible |
II. Malignant teratomas |
With areas of germ cell tumor |
Germinoma (seminoma, dysgerminoma) |
Embryonal carcinoma |
Choriocarcinoma |
Yolk sac tumor |
Mixed (any combination of the above) |
With nongerminal malignant tumor pattern |
Carcinoma |
Sarcoma |
Malignant embryonal tumor |
Mixed |
Immature teratoma, malignant |
A teratoma that would otherwise be classified as benign immature teratoma, but which subsequently became metastatic |
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