Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is somewhat rotated to the right . There is extensive airspace opacity projecting over the left lung , predominantly the mid to lower lung , with also some involvement of the upper lung . No large pleural effusion is seen . There is no pneumothorax . The cardiac and mediastinal silhouettes are grossly stable given differences in patient positioning . Evidence of hiatal hernia it is re - demonstrated . Left - sided chronic rib deformities in the upper left hemi thorax are redemonstrated .
    OUTPUT:
    
Large area of opacity involving the left lung worrisome for pneumonia . Recommend followup to resolution to exclude underlying mass . .