Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest were obtained . There is an opacity projecting over the left upper - to - mid lung which on the lateral view may be within the superior segment of the left lower lobe . Right mid lung perihilar opacity is also seen . No pleural effusion is seen . Patchy opacities over the right middle lobe on the lateral view may be due to atelectasis or underlying consolidation . The cardiac and mediastinal silhouettes are stable . There are degenerative changes at the right shoulder and acromioclavicular joint .
    OUTPUT:
    
Left upper - to - mid pulmonary opacity with central lucency , worrisome for cavitation . Additional right infrahilar nodular opacity . Findings infectious versus malignancy until proven otherwise .