Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post left thoracotomy and left upper lung pneumonectomy with unchanged deformities of the left lateral ribs and chest wall . Air-filled cavity within the left apex is re - demonstrated , but appears to contain increased opacification suggestive of increasing fluid . The size of this cavity is overall unchanged . Leftward shift of mediastinal structures is re - demonstrated . The heart size is normal . The pulmonary vasculature is not engorged . Streaky opacities in the left lung base may reflect atelectasis . Scarring within the right apex is unchanged . No acute osseous abnormalities demonstrated .
    OUTPUT:
    
Increased opacity within the left apical gas collection likely reflects increasing amount of fluid . Left basilar streaky opacity , likely atelectasis , although infection is difficult to exclude .