A chest radiograph revealed a large left lower hemithorax mass in a 48-year-old nonsmoker woman with chronic cough and dyspnea. Whole-body contrast-enhanced PET/CT confirmed a large mass with relatively uniform mild FDG uptake (standardized uptake value=1.8). No signs of infiltration, pleural effusion, significant regional lymph nodes, or extrathoracic lesions were seen. A presumptive diagnosis of a probable benign solitary fibrous tumor of the pleura (SFTP) was considered. SFTP was confirmed at surgery. Few reported cases have described the PET/CT findings of SFTPs.