CT (left of images) showing calcified areas and PET (right of images) scans showing increased FDG-PET metabolic activity in the mediastinal mass (A) and perihilar lymph nodes (B). FDG-PET, fluorodeoxyglucose-positron emission tomography. CT (left of images) showing calcified areas and PET (right of images) scans showing increased FDG-PET metabolic activity in the mediastinal mass (A) and perihilar lymph nodes (B). FDG-PET, fluorodeoxyglucose-positron emission tomography. Zhe Wu et al. BMJ Open Resp Res 2017;4:e000174 ©2017 by British Thoracic Society