Definition: A granuloma is a tiny lump of inflamed tissue in the body. It is called "granuloma" because it looks like a grain of sand or sugar. Sometimes granulomas can be seen on an x-ray. To confirm the diagnosis, a tissue sample (biopsy) is taken and examined with a microscope. In sarcoidosis, many granulomas may form and clump together. These clumps can affect how organs in the body, like the lungs or eyes, work.
Pronunciation: gran-u-LO-muh
