Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Low lung volumes are present . Heart size is borderline enlarged . Mediastinal and hilar contours are unremarkable . There is no pulmonary vascular congestion , but crowding of the bronchovascular structures is noted . Patchy bibasilar airspace opacities likely reflect atelectasis , though assessment is limited given the low lung volumes . No pleural effusion or pneumothorax is identified . No acute osseous abnormalities detected .
    OUTPUT:
    
Patchy bibasilar airspace opacities likely reflect atelectasis in the setting of low lung volumes , but infection is not completely excluded . Consider repeat radiographs with improved inspiratory effort for further assessment .