Fat appears ________ than the glandular tissue of the breast on ultrasound.

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On ultrasound, brightness reflects how much echo returns. Fat tissue has fewer internal interfaces and reflects fewer sound waves than the dense fibroglandular tissue, so it appears darker. Glandular tissue, with ducts and fibrous stroma, provides more echoes and looks brighter. Therefore, fat is less echogenic than the glandular tissue of the breast.