Grade | Description of extension |
Grade 1 | The tumor diameter is within 10 mm and grows in the saddle |
Grade 2 | The tumor extends up to 10 mm to the sella and fills the suprasellar cistern |
Grade 3 | The tumor extends 10 ~ 20 mm to the sella, raising the third ventricle |
Grade 4 | The tumor extends 20 ~ 30 mm above the sella and compresses the anterior part of the third ventricle |
Grade 5 | The tumor extended more than 30 mm above the sella and reached the Monro foramen of the lateral ventricle with obstructive hydrocephalus |
Grade | Description of invasion |
A | Adenoma involving the suprasellar cistern upwards |
B | Adenoma extends upwards to the base of the third ventricle, causing it to protrude upwards |
C | Adenoma involving the anterior one-third of the third ventricle upwards |
D | Asymmetric upward growth, with adenomas protruding into the intracranial cavity and reaching the level of the interventricular foramen |
E | Asymmetric lateral growth, invading the cavernous sinus |