Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest . In the lingula , there is a heterogeneous opacity concerning for either pneumonia or lung mass . The right lung is clear . There is no pleural effusion . There is no pneumothorax . The osseous structures are unremarkable .
    OUTPUT:
    
Opacity in the lingula . Given recent infection , pneumonia is likely ; however , given long history of smoking , a mass can not be ruled out . Followup imaging is recommended . These findings were discussed with Dr . ___ at 5 : 15 p .m . on ___ by telephone .