Submitted by wcm_neurosurger... on May 25, 2022 - 3:42pm
Definition:
The standard established by the World Health Organization (WHO) to rate tumors.
- Grade I tumors are slow-growing, nonmalignant, and associated with long-term survival.
- Grade II tumors are relatively slow-growing but sometimes recur as higher grade tumors. They can be nonmalignant or malignant.
- Grade III tumors are malignant and often recur as higher grade tumors.
- Grade IV tumors reproduce rapidly and are very aggressive malignant tumors.