http://www.nhlbi.nih.gov/health/dci/Diseases/sarc/sar_whatis.html
National Heart, Lung, and Blood Institute, National Institutes of Health
Sarcoidosis (sar"koi-do'sis) involves inflammation that produces tiny lumps of cells in various organs in your body. The lumps are called granulomas (gran"u-lo'mahs) because they look like grains of sugar or sand. The publication links to more information about the disease, including causes, signs and symptoms, diagnosis, and treatments.