Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lateral view is somewhat suboptimal due to patient 's overlying arm . There are low lung volumes , which accentuate the bronchovascular markings . There is left base retrocardiac opacity with subtle suggestion of air bronchograms , worrisome for pneumonia . There is also blunting of the left costophrenic angle which may be due to a small pleural effusion . There is stable minimal blunting of the right costophrenic angle . No pneumothorax is seen . The cardiac and mediastinal silhouettes are stable . Degenerative changes at the glenohumeral joints are partially imaged .
    OUTPUT:
    
Findings worrisome for left lower lobe pneumonia with possible associated small left pleural effusion . Recommend followup to resolution .