breast,galactocele

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Cystic mass with fat-fluid level galactocele. (a) Mammogram reveals an oval circumscribed mass with the characteristic fat-fluid level (arrows). In this type of galactocele, the milk content is fresh and fluid, allowing the fat to rise and the heavier water content to remain in the lower portion of the cyst. (b) US image also demonstrates the fat-fluid level (long arrows), with typical high and low echogenicity. Note that the fatty component has risen and occupies the upper (nondependent) portion of the cyst, whereas the heavier water content remains in the lower (dependent) portion. Note also the clot of fatty milk (“cream”) (short arrow) floating in the nondependent portion of the cyst owing to its intermediate density.

http://radiographics.rsna.org/content/27/suppl_1/S101.figures-only