Kernohan grading of astrocytomas

The Kernohan grading system was fist described in 1949 and is no longer used. It was replaced by the WHO grading system.

Grade Description
Grade 1 benign astrocytoma
Grade 2 low-grade astrocytoma
Grade 3 anaplastic astrocytoma
Grade 4 glioblastoma


1. KERNOHAN JW, MABON RF. A simplified classification of the gliomas. Proc Staff Meet Mayo Clin. 1949 Feb 2;24(3):71–5.