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What is the most likely diagnosis?
Hamartoma is the most likely diagnosis. It contains fat and soft tissue density.
What is the differential diagnosis of such lesion?
Fat-containing breast lesions: 1- breast lipoma 2- breast hamartoma 3- fat necrosis of the breast/oil cyst 4- galactocoele
A well-defined capsulated rounded to oval mosaic mass is seen at the retroareolar region of the left breast. It shows alternating hypodense and hyperdense components (fat containing).