Tubule Formation
1 - >75% of tumor has tubules
2 - 10 to 75% of tumor has tubules
3 - <10% of tumor has tubules
Nuclear Size
1 - similar to normal duct epithelium
2 - intermediate size nuclei
3 - large vesicular nuclei with prominent nucleoli
Mitotic Count (calibrated to
Olympus BX50-Sx Pth)
1 - 0 to 8 mitoses per ten 40x fields (2.3 square mm)
2 - 9 to 16 mitoses
3 - >16 mitoses
