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

Invasive mammary carcinoma, combined histologic grade 2 of 3, CHG II of III, low power.
Moderately differentiated. The majority of male breast carcinomas are moderately or poorly differentiated. Tumor tubule formation, seen with well differentiated tumors, is not present in this photomicrograph.