Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Tracheostomy in situ with it 's positions unchanged . Low lung volumes complicates interpretation of this radiograph . There is increased opacification seen in the medial aspect of the left lower lobe which may be secondary to bronchovascular crowding / atelectasis or consolidation . No large pleural effusion . No pneumothorax .
    OUTPUT:
    
Repeat optimal inspiratory radiograph advised .