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Sarcoidosis is an uncommon autoimmune disorder of unknown cause that primarily affects younger individuals. The disease is characterised by the presence of non-caseating granulomas which can appear almost anywhere in the body but usually appear in the lungs. Sarcoidosis can sometimes have the appearance of tuberculosis.

Sarcoidosis is more commonly seen in blacks than whites. Pulmonary (lung) involvement is the most common presentation of sarcoidosis.

Sarcoidosis is a restrictive disease of the lungs, causing a decrease in lung volume and decreased compliance (the ability to stretch). The vital capacity (full breath in, to full breath out) is decreased, and most of this air can be blown out in the first second. This means the FEV1/FVC ratio is increased from the normal of about 80%, to 90%.

Treatment usually includes corticosteroids.

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