Figure 8 provides an algorithm based on recent ATS guidelines for the diagnosis of sarcoidosis and that incorporates the value of minor salivary gland biopsy (MSGB) and 18F-FDG PET in sarcoidosis diagnosis [27,36,99]. Two studies in uveitis patients showed that granulomas were only found on MSGBs in patients with elevated ACE or with a compatible chest CT [203,204]. The gene discussed is ACE; the disease is uveitis.