However, a study of 27 patients suffering from SPN using delayed FDG-PET imaging in a tuberculosis endemic region such as Taiwan, found no significant difference in mean SUV, maximal SUV and retention index between benign and malignant solitary pulmonary nodules with an initial mean SUV less than 2.5; the area under the receiver operating curve did not differ from 0.5.10 Accordingly, we aimed to a