A breastfeeding patient presents with fever, leukocytosis, left breast redness and pain. Ultrasound shows ductal dilation and echogenic changes. What is the most likely diagnosis?

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The main idea is an inflammatory/infectious process of the breast during lactation—mastitis. In a breastfeeding patient, fever and leukocytosis with a tender, red, and painful breast strongly point to an infection of the milk-producing tissue. The ultrasound finding of ductal dilation and echogenic changes fits this pattern because milk stasis can dilate the ducts and the surrounding tissue becomes edematous and inflamed, producing echogenic debris within the ducts and parenchyma.

If it were a breast abscess, you’d expect a discrete fluid collection on ultrasound, often with irregular or thickened walls and possibly gas or pus, representing a localized pus pocket. A galactocele would typically appear as a cystic lesion containing milky fluid, usually without surrounding inflammatory signs or systemic symptoms. A fibroadenoma is a solid, well-defined mass that tends to occur in younger patients and is not associated with fever, redness, or lactation-related ductal changes.

So the combination of systemic inflammatory signs with the breast-specific clinical picture and the ultrasound pattern of ductal dilation with inflammatory echogenic changes points to mastitis.