Sandbox:MGS

According to Gonzalez-Crussi System, Sacrococcygeal teratoma is graded on a scale from 0-3, based on the histology:

Grade	Microscopic Features
Grade 0	Tumor contains only mature tissue
Grade I	Tumor contains rare foci of immature tissues Less than 10% tissue is Immature
Grade II	Tumor contains moderate quantities of immature tissues. Upto 10-50% tissue in immature
Grade III	Tumor contains large quantities of immature tissue with or without malignant yolk sac elements. More than 50% tissue is immature