Note: Based on a microscopic field with a diameter of0.44 mm and an area of 0.152 mm
(Nikon Labophot microscope with ax40 objective lens)
Tumor grade (Tubule formation nuclear pleomorphism +mitotic count)
3 to 5 points Grade I, well differentiated
6 to 7 points-Grade II, moderately differentiated
8 to 9 points Grade III, poorly differentiated