Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Status post left superior segmentectomy with low lung volumes . Left - sided chest tube has a very superior and medial course . minimal subcutaneous emphysema . Tiny left apical pneumothorax . Low lung volumes with subsegmental and segmental atelectasis . Mild cardiac enlargement with mild edema , most pronounced in the left lower lobe . Upper mediastinum appears widened , likely related to low volumes and recent surgery .
    OUTPUT:
    
Small left apical pneumothorax . Mild cardiac enlargement with mild edema , most pronounced in the left lower lobe .