This study aimed to identify markers of granulomatous inflammation in the exhaled breath condensate (EBC) of patients with sarcoidosis compared to healthy controls. The study found that levels of neopterin and transforming growth factor beta-1 were increased in the EBC of sarcoidosis patients compared to controls. However, angiotensin-converting enzyme activity was low and not significantly different between the two groups. The authors conclude that EBC may be a useful non-invasive method for monitoring sarcoidosis and identifying patients at risk of pulmonary fibrosis, but further large studies are needed.