“…These agents can be categorized into bacterial (tuberculosis, leprae, salmonella, brucella, syphilis, Q fever, cat scratch disease), chlamydial (lymphogranuloma venereum), fungal (histoplasmosis, blastomycosis, coccidiomycosis), helminthic (schistosomiasis, filariasis, trichinosis) infections, metals (berylliosis, zirconium), organic salts, foreign bodies (silicosis, asbestosis), and etiologically unknown diseases (sarcoidosis, Crohn's disease, Wegener's granulomatosis, primary biliary cirrhosis). The most common granulomatous disease in Turkey and in developing countries is mycobacterial infection-related tuberculosis [2,3]. The presence of a large number of macrophages and lymphocytes in granulomatous diseases is associated with high uptake of 18F-fluoro-2-deoxy-d-glucose (FDG) mimicking lung cancer on PET imaging [3,4].…”