Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest were obtained . The lateral view is suboptimal due to the patient 's overlying arm . Per the radiology technologist , the patient would not follow commands , could not control head motion , best possible images . Left lower lung opacity is similar in appearance and again may reflect combination of atelectasis with possible pleural effusion , although aspiration or infection can not be excluded on this study . There is slight blunting of the right costophrenic angle and a trace pleural effusion on the right may be present . Cardiac and mediastinal silhouettes are stable . No evidence of pneumothorax is seen . The patient 's chin overlies the medial lung apices .
    OUTPUT:
    
No significant interval change . Persistent left base opacity could represent a combination of atelectasis and pleural effusion , however , consolidation due to aspiration or infection can not be excluded . Possible trace right pleural effusion .