Microwave imaging shows promise for breast cancer screening by taking advantage of the dielectric property differences between normal and malignant breast tissues. A microwave imaging system was developed at Dartmouth that incorporates patient anatomical information from MRI to improve the spatial resolution of the reconstructed microwave images. Initial phantom and clinical studies demonstrate that including structural information enhances the ability to detect and characterize abnormalities. Further research is still needed including bilateral breast imaging and customized MRI coils to enable viable 3D microwave imaging.