Female teenager who 2 weeks agon developed a fever and erythema around the nipple of the breast and now has drainage of fluid from the nipple

US of pediatric breast abscess
Transverse (above) and sagittal (below) color doppler US of the breast show a poorly defined retroareolar mass that has a hyperemic thick wall with a multiloculated hypoechoic center. The surrounding subcutaneous fat is hyperechoic.

The diagnosis was mastitis evolving into a breast abscess.