Digital Atlas of Breast Pathology by Meenakshi Singh, MD © - Department of Pathology, Stony Brook University Medical Center

Invasive ductal carcinoma, CHG 2 of 3, low power.
This tumor is moderately differentiated due to focally poor tubule formation (2 of 3), increased nuclear pleomorphism (3 of 3), and higher mitotic activity (2 of 3).