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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.
Sonogram / Ultrasound scan, can find out if a nodule on a mammogram, is a solid nodule, or a cystic lesion, breast cysts tend to be fluid filled. Suppose an ultrasound report said there is a hypoechoic nodule, or a hypoechoic lesion in a breast, perhaps also saying it is solid.