Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A portable frontal chest radiograph again demonstrates an endotracheal tube which is unchanged in position . A right infrahilar opacity is similar in appearance to prior radiograph and again could represent overlap of vascular structures , but underlying consolidation is not excluded . Streaky linear opacities at the left base are also unchanged and likely represent atelectasis . The heart is normal in size and there is no pleural effusion or pneumothorax .
    OUTPUT:
    
Unchanged chest radiograph . A right infrahilar opacity may represent overlapping vascular structures , but underlying consolidation can not be excluded .