Multiple Nodules in the Lungs
Multiple nodules in the lungs or multiple pulmonary nodules (MPN) refer to two or more lesions in the lungs. The most common cause of MPN is metastatic cancer or cancer spread from other parts to the lungs. Causes of MPN can be malignant (cancerous) or benign (noncancerous). The most common ones include
- Breast cancer
- Colon cancer
- Prostate cancer
- Bladder cancer
- Medullary thyroid cancer
- Squamous cell cancer of the head and neck
Benign causes include
- Benign tumor: Abnormal growth or mass in the lungs may be benign or malignant. Types of benign tumor include
- Lung infections: Infections associated with MPN include
These infections result in inflammation, which further forms a granuloma. A granuloma is a small cluster of cells that form when the lung tissue is inflamed. It develops when the immune system isolates any foreign substance in the lungs or other parts of the body. It can become calcified over time because calcium tends to accumulate in the healing tissue.
- Inflammatory disorders (noninfectious): Other inflammatory disorders that may cause granuloma formation in the lungs include
- Rheumatoid arthritis (a generalized disease of the connective tissues)
- Granulomatosis with polyangiitis (inflammation of the small blood vessels characterized by lesions that kill the cells in different organs of the body)
- Sarcoidosis (a disease characterized by granular lesions of unknown cause that involve various organs of the body)
- Lipoid (resembling fat) pneumonia
- Black lung disease: It mainly occurs in coal miners and often causes nodules that are 1-2mm in diameter. It involves the formation of fibrous tissue due to a reactive process.
- Scar from past infections: These may show up as nodules in chest X-rays. These may be common in people who never realized that they had an infection.
Health Solutions From Our Sponsors