Case 8

Explanation: The fat-containing mass shown below is present in the lower outer quadrant of the left breast.

Mammography is not a sensitive modality to assess for silicone implant rupture, although there is no gross evidence of extracapsular silicone implant rupture on these images. Saline implant rupture is a clinical diagnosis.

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Explanation: A rim calcification is composed of a continuous rim of thin (≤ 1 mm) calcification that surrounds a round or oval structure, usually with distinct internal fat density, as is true for this case. This large rim calcification has the typical appearance of fat necrosis, as can be seen in the setting of prior breast trauma or surgery (such as implant placement). Oil cysts or simple cysts (not shown in this case) can also have smaller rim calcifications. Rim calcifications are typically benign.