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nodule - (mineralogy) a small rounded lump of mineral substance (usually harder than the surrounding rock or sediment) mineralogy - the branch of geology that studies minerals: their structure and properties and the ways of distinguishing them.
A hypoechoic nodule is a fluid-filled or solid mass that casts limited, weakened echoes compared to the surrounding tissue during the administration of an ultrasound, or sonogram. Though this type of mass may be found in any part of the body, it is most frequently detected in the thyroid.