Introduction: Invasive Ductal Carcinoma (IDC) is the most common form of breast cancer, with dense breast tissue being a significant risk factor. Early detection is critical for improving patient outcomes, but dense breast tissue can mask tumors on standard mammography, making detection difficult. Objective: To assess the diagnostic effectiveness of 3D mammography and MRI in detecting early-stage invasive ductal carcinoma in women with dense breast tissue.Methodology: A retrospective analysis was conductedand a total of 365 women with dense breast tissue who underwent both 3D mammography and MRI for breast cancer screening were added in the study. The diagnostic performance of each modality was compared, focusing on sensitivity, specificity, and accuracy.Results:MRI demonstrated higher sensitivity (92%), specificity (83%), and accuracy (90%) compared to 3D mammography (85%, 78%, and 84%, respectively). MRI detected more early-stage IDC cases, including Stage I (12%) and Stage II (19%), compared to 3D mammography at 10% and 11%. It also outperformed 3D mammography in detecting smaller tumors (<1 cm and 1-2 cm). Overall, MRI proved more effective in detecting early-stage IDC in women with dense breast tissue.Conclusion: MRI shows superior sensitivity and accuracy compared to 3D mammography in detecting early-stage IDC in women with dense breast tissue, highlighting its potential as a complementary screening tool for high-risk patients.