I assume that you are referring to a “shadow” seen on a Chest X-ray or a CT Scan of the lungs. A parenchymal mass lesion is an abnormal shadow, usually not containing air, present in the substance of the lung or, less commonly, present in or attached to other (than the lung) major structures in one’s chest. Interpretation is based on a number of factors including, but not limited to the size, location, density, its surface and the presence or absence of calcium within the mass. A mass is always deemed to be an abnormal finding that requires further investigation.
You should discuss this, in more detail, with your physician.
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