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A lung mass is a term used to describe an abnormal growth in the lungs that is larger than three centimeters. Smaller growths are often referred to as nodules. These masses can be benign (non-cancerous) or malignant (cancerous). It's important to understand that not all lung masses are cancerous , and various factors determine the likelihood of malignancy. Definition and Differentiation Understanding what constitutes a lung mass is fundamental. A mass is generally defined as