Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single frontal view of the chest demonstrates intact median sternotomy wires . New irregular opacification at both lung bases could be pneumonia due to virus or mycoplasma infection or aspiration . Vertically oriented lucency projecting to the left of the lower trachea could be air in a thick walled esophagus ; consider esophagitis or other infiltrative abnormality thickening the esophageal wall . The heart is normal size and there is no vascular congestion or appreciable pleural effusion to point to cardiac decompensation . There is no pneumothorax , vascular congestion , or pleural effusion .
    OUTPUT:
    
Probably pneumonia , due to aspiration or atypical pathogen . Possible esophageal abnormality should be evaluated at least clinically , if not with a contrast swallow . atyp pna or aspiration