Sebaceous cyst of the breast
Citation, DOI and case data
The patient had a palpable mass in the inner lower quadrant of her right breast, that had been known to her for years. There was a slight bulging and hyperpigmentation of the skin in that region.
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The 3.5 x 2.2 cm lesion showed smooth margins, lateral acoustic shadowing, and dorsal acoustic enhancement, similar to a fibroadenoma, but with more heterogeneous content.
The clue to the diagnosis is the partly intracutaneous location.