Incidentally detected breast lesions on chest CT with US cor
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Although chest computed tomography (CT) usually covers the whole breast tissue, it is not the primary method for the evaluation of the breast. Chest CT has the drawback of exposing breasts to radiation. Inoue et al. reported that the radiation dose at the skin surface of the breast during CT scanning was approximately ten times greater than the dose received during standard mammography.

However, recent studies have reported the importance of chest CT for the detection of unexpected breast lesions. These breast lesions may include primary and secondary malignancies, as well as benign lesions, including benign calcification, fibroadenomas, and lipomas. Sometimes, CT may be the first modality to demonstrate a new primary breast cancer. In recent literature, the prevalence of breast cancers among incidental lesions detected using CT varied from 24% to even 70%. Therefore, it may be important for radiologists to pay attention to the breast during routine chest CT examinations.

In this pictorial essay, we illustrate incidental breast lesions that are encountered while interpreting chest CT in our institution. For each lesion that was originally detected by CT, ultrasonography (US) findings are also presented.

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