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What is a solitary pulmonary nodule (SPN)?

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A solitary pulmonary nodule (SPN) is a single abnormality in the lung that is smaller than 3 cm in diameter. Generally, a pulmonary nodule must grow to at least 1 cm in diameter before it can be seen on a chest X-ray.

An SPN is surrounded by normal lung tissue and is not associated with any other abnormality in the lung or nearby lymph nodes (small, bean-shaped structures found throughout the body).

SOURCE: Solitary Pulmonary Nodule from eMedicineHealth. American Lung Association: "Lung Cancer Fact Sheet." UpToDate: "Diagnostic evaluation of the incidental pulmonary nodule." CDC: "Nocardiosis."

Reviewed by Sabrina Felson on January 25, 2020

SOURCE: Solitary Pulmonary Nodule from eMedicineHealth. American Lung Association: "Lung Cancer Fact Sheet." UpToDate: "Diagnostic evaluation of the incidental pulmonary nodule." CDC: "Nocardiosis."

Reviewed by Sabrina Felson on January 25, 2020

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What are the symptoms of a solitary pulmonary nodule (SPN)?

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