Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest demonstrate likely normal cardiomediastinal silhouette allowing for AP technique . Current study is somewhat limited due to underpenetration . There is increased opacity in the left base with blunting of the posterior costophrenic angle which could represent atelectasis and small left pleural effusion , although early pneumonia in this location can not be excluded . The upper left lung and right lung are well aerated . There is no pneumothorax or vascular congestion .
    OUTPUT:
    
Somewhat limited study . Likely atelectasis with small left pleural effusion , with early pneumonia not excluded in the appropriate clinical setting .