Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal view of the chest shows no acute intrathoracic process . Basilar reticular opacifications relate to chronic lung disease are unchanged from prior studies . There is no pleural effusion or pneumothorax . The mediastinal structures are unremarkable and the heart size is normal . There are calcifications seen within the aortic arch and mitral valve . Degenerative changes of the cervical spine are noted . No definite fractures are seen , however , the left shoulder is not fully evaluated .
    OUTPUT:
    
No acute intrathoracic process . Lungs better characterized on concurrent chest CT .