In a lactating patient with suspected mastitis, which ultrasound finding is most likely?

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Multiple Choice

In a lactating patient with suspected mastitis, which ultrasound finding is most likely?

In lactation, mastitis often stems from milk stasis with obstruction of the ducts, so the hallmark ultrasound finding is dilation of the milk ducts. These ducts widen as milk backs up proximal to the blockage and inflammation sets in, and you may see fluid or debris within them along with surrounding soft-tissue edema and possibly increased blood flow on Doppler due to inflammation. This pattern fits the clinical scenario of acute mastitis during breastfeeding. Calcifications are more typical of chronic or nonlactational changes and are not the expected acute finding here. A well-defined cyst could appear, such as a galactocele, but it is not the primary imaging feature of acute mastitis. A solid mass raises concern for an underlying abscess or tumor, which is less characteristic as the initial or most likely ultrasound presentation of lactational mastitis.

In lactation, mastitis often stems from milk stasis with obstruction of the ducts, so the hallmark ultrasound finding is dilation of the milk ducts. These ducts widen as milk backs up proximal to the blockage and inflammation sets in, and you may see fluid or debris within them along with surrounding soft-tissue edema and possibly increased blood flow on Doppler due to inflammation. This pattern fits the clinical scenario of acute mastitis during breastfeeding.

Calcifications are more typical of chronic or nonlactational changes and are not the expected acute finding here. A well-defined cyst could appear, such as a galactocele, but it is not the primary imaging feature of acute mastitis. A solid mass raises concern for an underlying abscess or tumor, which is less characteristic as the initial or most likely ultrasound presentation of lactational mastitis.

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