Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single portable semi-upright view of the chest demonstrates the patient in a very oblique position , making it difficult to evaluate the heart and lungs . Allowing for this limitation , there is cardiomediastinal widening . The left lung is clear . A chest tube projects over the right hemithorax . There is a moderate - sized pneumothorax at the right apex , which is expected postoperatively .
    OUTPUT:
    
Moderate - sized pneumothorax at the right apex .