Nipple not in profile
A nipple not in profile will be projected over the breast tissue, and may simulate a mass lesion (as in this case), or obscure a true abnormality.
The absence of a nipple in profile, and the low-lying position of the nipple on the MLO view provide further clues. Comparison with the contralateral breast is likely to show symmetrical findings.
Repeat CC view with nipple in profile
If the CC view is repeated with the nipple in profile, the apparent mass lesion disappears.
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