On the CT we can see normal stroma in the right breast, but no normal stromal tissue in the central and retroareolar region of the left breast. Instead there is a suggestion of a rounded area of fat attenuation (green dotted line). In the deep medial left breast, there is a flattened region that looks like a muscle (red), but it is not the pectoralis major or minor. It is an abdominal muscle, rectus abdominus, that has been dissected free from its normal attachments and moved, along with overlying fatty tissue, into the breast after a mastectomy to reconstruct the breast. The missing right rectus abdominus is shown by the red dotted line. This procedure is called a TRAM flap (transverse rectus abdominus muscle). There is incidental note of small left kidney (yellow) unrelated to the prior breast surgery.

This is a left CC view, showing unusual shape and distribution of dense stroma in the breast. Instead of being mostly behind the nipple (blue) and in the outer breast (top part of image), it is all in the deep medial breast, with a slight suggestion of a swirling pattern (red), and adjacent surgical clips (yellow).