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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 lung nodule is also called a spot on your lung (pulmonary nodule). It is usually round or oval in shape. They are easy to find but can be hard to diagnose. Nodules are found in 1 out of every 4 chest CT scans. Most nodules (more than 90%) are benign and not cancerous.