Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Upright frontal view of the chest is limited by patient rotation . Within this limitation , there is no acute intrathoracic process . The mediastinal , pleural and pulmonary structures are unremarkable . There is no pleural effusion or pneumothorax identified . Calcifications are noted within the aortic arch . Degenerative changes of the cervical spine and clips overlying the left neck are seen .
    OUTPUT:
    
Limited study , however , no acute intrathoracic process .