Final answer:
Fat necrosis is an encapsulated area that forms in the mammogram due to surgery, biopsy, trauma, or radiation therapy. It occurs when fatty tissue in the breast is damaged, resulting in the formation of a lump or mass.
Step-by-step explanation:
The lesion described in the question is called fat necrosis. This is an encapsulated area that forms in the mammogram and can be caused by surgery, biopsy, trauma, or radiation therapy. Fat necrosis occurs when the fatty tissue in the breast is damaged, leading to the formation of a lump or mass. It can be identified on a mammogram as an area of increased density.