Cancer Lung Cancer Symptoms What Are Multiple Lung Nodules? By Lynne Eldridge, MD facebook Lynne Eldrige, MD, is a lung cancer physician, patient advocate, and award-winning author of "Avoiding Cancer One Day at a Time." Learn about our editorial process Lynne Eldridge, MD Medically reviewed by Medically reviewed by Doru Paul, MD on November 19, 2020 Doru Paul, MD, is triple board-certified in medical oncology, hematology, and internal medicine. He is an associate professor of clinical medicine at Weill Cornell Medical College and attending physician in the Department of Hematology Oncology at the New York Presbyterian Weill Cornell Medical Center. Learn about our Medical Review Board Doru Paul, MD on November 19, 2020 Print Table of Contents View All Table of Contents Symptoms Causes Diagnosis Treatment If you've had a chest X-ray or other imaging and have been advised that the radiologist spotted multiple lung nodules, the first thing that may come to mind is cancer. When lung nodules occur in isolation (solitary pulmonary nodule (SPN), cancer is infrequently the case. But when there are several or many, the risk of cancer increases. Multiple pulmonary nodules (MPN) is the term used to define cases of two or more lung lesions. Possible Causes of a Lung Mass Nodule Characteristics Lung nodules will typically be seen as spots or lesions on an X-ray and measure 3 centimeters (roughly 1.2 inches) or less in diameter. They are a fairly common finding, occurring in between 3.9 and 6.6 of every 1,000 chest X-rays in the United States. When MPN are seen on a scan, the first assumption is cancer. In fact, cancer is the most common cause of MPN and is usually the result of metastasis (when cancer spreads from a primary tumor to the other parts of the body). But "most common" doesn't mean "only." There are nearly as many benign (non-cancerous) causes of MPN as there are malignant (cancerous) ones. The way that the nodules look on a scan can suggest which type they are. More Likely to Be Cancerous Multiple nodules that are 8 millimeters (mm), roughly 1/4 inch, or more in diameter Nodules described as "non-calcified" (with evenly distributed "ground-glass" appearance) More Likely to Be Benign Nodules that are less than 5 mm (1/5 inch) are more likely to be benign, especially when distributed in the fissures between the lobes of the lung or along the tissue that lines the lung Nodules described as "calcified" (seen on X-ray with random spots and flecks) What Does a Shadow on the Lung Mean? Causes Illustration by Jessica Olah, Verywell MPN may be caused by malignant or benign diseases. The more common ones can be broken up as follows. Cancerous Metastatic cancer is the predominant cause of MPN, especially in persons with a family history of cancer. It is most associated with metastases to the lung from breast cancer, colon cancer, prostate cancer, and bladder cancer. MPNs have also been seen with metastases from medullary thyroid cancer, melanoma, and squamous cell cancers of the head and neck, among others.Primary cancer may also be the cause of MPNs, with lung cancer (particularly bronchioloalveolar carcinoma) and lymphomas being the most common causes. Benign Mediastinal lymph nodes are located along the lining of the lung and, like all lymph nodes, can become enlarged during infection. This can sometimes be read as a spot on an X-ray.Benign tumors can also develop in the lungs, the most common of which are tissue malformations called hamartomas. Other types of benign tumors include fibromas, bronchial adenomas, hemangiomas, and blastomas.Autoimmune disorders are those in which the immune system inadvertently attacks the body's own cells. They can sometimes form granulations and growths that appear as spots on an X-ray. Causes include rheumatoid arthritis, sarcoidosis, and eosinophilic lung diseases.Lung infections can sometimes appear as a solitary or multiple diffuse nodules on a scan. These include bacterial infections such as tuberculosis, fungal infections such as cryptococcosis, and parasitic infections such as echinococcosis.Coal workers' pneumoconiosis, also known as black lung disease, still occurs in around 2% of coal miners and often manifests with 1-millimeter to 2-millimeter nodules. There has been an increase in the incidence of severe black lung disease (progressive massive fibrosis) in young coal workers in Appalachia.Scars from past infections can also show up on chest X-rays as nodules, often in people who never realized they had an infection. How to Tell If a Lung Tumor Is Benign Diagnosis Since the most common cause of MPN is metastatic cancer, doctors will often begin their investigation by looking for a primary (original) tumor. Depending on what the early diagnostics say, the doctor may order a mammogram or breast magnetic resonance imaging (MRI) to look for a breast tumor, or a colonoscopy to look for a colon tumor. Additional imaging tests can be used, including: Computed tomography (CT), which uses a series of X-ray images to create a three-dimensional scanMagnetic resonance imaging (MRI), which uses powerful magnetic waves for imaging of soft tissues that can reveal nodules in many parts of the body, including the lungsPositron emission tomography (PET) scan, which can detect hyperactive cell metabolism and angiogenesis (new blood vessel formation), such as occurs with cancer The current thinking among radiologists is that the combination of CT and PET scans is more useful in determining the cause of MPNs than the individual tests on their own. If the cause of your nodules is still unclear after imaging, a lung biopsy may be performed to obtain a tissue sample. The distribution of lung nodules can also be helpful in narrowing down causes. For example, coal workers' pneumoconiosis most often causes nodules that are predominant in the upper lobes, while lymphoma typically manifests with nodules around the airways. How Lung Cancer Is Diagnosed Treatment The treatment of MPN will depend on the cause. Benign nodules can often be left alone. Nodules related to an infection can be treated with the appropriate antibiotic, antifungal, or antiparasitic drug. If metastatic cancer is diagnosed, treatment would be prescribed based mainly on the location of the primary tumor and the extent of the metastases. This can vary from one cancer type to the next. For example, nodules related to metastatic breast cancer may be treated with a combination of a lumpectomy or mastectomy, radiation therapy, chemotherapy, endocrine therapy, and newer targeted drugs like Ibrance (palbociclib). By contrast, nodules related to the metastatic colon may be treated a colon resection accompanied by chemotherapy and targeted drugs like Avastin (bevacizumab). Meanwhile, primary cancers like lymphoma that manifest with MPNs may require chemotherapy, radiation therapy, biologic therapy, immunotherapy, stem cell transplantation, CAR T-cell therapy, or a combination of these. Newer techniques such as stereotactic body radiotherapy (SBRT) may be used to treat a single metastasis and, sometimes, multiple metastases. If there are few, treating the malignant nodules may improve survival. Treating Metastatic Cancer to the Lungs A Word From Verywell No matter your medical history, being told that you have multiple lung nodules can be frightening. But keep in mind that many MPNs are benign, and some may not even require treatment of any sort. Even if your nodules are cancerous, there are almost always treatment options available. They may not be curative, but they can reduce symptoms and often extend life significantly. Take things one step at a time and ask as many questions as you need to make a fully informed decision. How Curable Is Lung Cancer? Was this page helpful? Thanks for your feedback! Limiting processed foods and red meats can help ward off cancer risk. These recipes focus on antioxidant-rich foods to better protect you and your loved ones. Sign up and get your guide! Sign Up You're in! Thank you, {{form.email}}, for signing up. There was an error. Please try again. What are your concerns? Other Inaccurate Hard to Understand Submit Article Sources Verywell Health uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles. Read our editorial process to learn more about how we fact-check and keep our content accurate, reliable, and trustworthy. Loverdos K, Fotiadis A, Kontogianni C, Iliopoulou M, Gaga M. 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