Pulmonary fibrosis is one form of interstitial lung disease (ILD). This causes inflammation or swelling that leads to scarring or fibrosis in the interstitium of the lungs. The interstitium is the area between the air sacs and the blood vessels. The ultimate goal of treatment is to clear the inflammation before it leads to fibrosis. Once fibrosis has occurred it cannot be reversed.
Sarcoidosis is a disease that causes small clusters of inflammation, called granulomas. The granulomas can occur in any area of the body, but are most often found in the lungs, lymph nodes, eyes, and skin. Typically sarcoidosis effects only the lungs. When sarcoidosis effects the lungs, it can cause enlarged hilar lymph nodes. These are in the upper middle area of the lungs. In fact, enlargement of the hilar lymph nodes is the most common finding when sarcoidosis effects the lungs. Adenopathy is another term for enlarged lymph nodes. So hilar adenopathy is another way of saying the lymph nodes in the upper middle area of the lungs near the heart are larger than usual. When the inflammation occurs in the lungs it may show up as cloudy areas on the CT scan. Up to one half of the people with sarcoidosis improve without treatment. This type of inflammation seldom leads to scarring or fibrosis.
A granuloma is a small cluster or nodule of inflammation that can occur in any area of the body, including the lungs. If this inflammation leaves behind a scar this is also called a granuloma. This inflammation could have been due to an infection in the lungs from tuberculosis or a fungus. In certain parts of the United States fungal infections are a common cause of granulomas. In the southwest it’s the fungus Coccidioidomycosis that causes valley fever and in the mid-west it’s the fungus Histoplasmosis.
The most common reasons for using the term "old granuloma" is to describe a granuloma that
· looks the same as it did when it was seen on a previous chest x-ray and/or,
· is calcified.
An elevated erythrocyte sedimentation rate (ESR) and anti-nuclear antibody (ANA) show that there is inflammation someplace in the body, but do not tell anything about the location.