Lung NoduleA lung nodule is a small growth on the lung. To be considered a lung nodule, the growth usually must be smaller than 3 centimetres. Lung nodules are either considered noncancerous or cancerous. A noncancerous nodule is called benign, and a cancerous lung nodule is referred to as malignant. Growths that are larger than 3 centimetres are usually called lung masses and typically have a higher chance of being cancerous. Noncancerous lung nodules can have a variety of causes, including:
- Infection: Infections, such as previous tuberculosis, or tuberculosis exposure can cause inflammation. A group of cells called a granuloma may form around the inflamed area in the lung.
- Non-infectious inflammation: Inflammation that is not related to an infection can also develop in the lung.
- Non-cancerous tumours: Non-cancerous growths, such as a fibroma, which is a benign growth of connective tissue, may also develop in the lung.
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