Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The exam is limited by patient 's underlying pathology of osteogenesis imperfecta . There has been decrease aeration of the left lung since prior study . This may represent atelectasis or pneumonia in the appropriate clinical setting . The bones are diffusely demineralized and there are extensive osseous deformities .
    OUTPUT:
    
Severely limited study , decreased aeration seen of the left lung .