Annals of Hepato-Biliary-Pancreatic Surgery

Table. 1. Table 1

Extragonadal teratomas classification [10]

Tumor elements	Gonzalez-Crussi grading system
Benign teratomas
Mature teratoma	Grade 0: All components are well differentiated
	Grade 1: Microscopic foci contain incompletely differentiated tissues, not exceeding 10 percent
Immature teratoma, benign	Grade 2: Immature tissues make up between 10 and 50 percent of the sample
	Grade 3: Over half of the surface is composed of undifferentiated tissues of uncertain metastatic potential
Malignant teratomas
With areas of germ cell tumor	Germinoma Embryonal Carcinoma Choriocarcinoma Yolk sac tumor Mixed
With nongerminal malignant tumor pattern	Carcinoma Sarcoma Malignant embryonal tumor Mixed
Inmature teratoma, malignant	A teratoma that would otherwise be classified as benign inmature teratoma, but which subsequently became metastatic

Ann Hepatobiliary Pancreat Surg 2021;25:544-50 https://doi.org/10.14701/ahbps.2021.25.4.544