Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Two portable frontal chest radiographs were obtained . An endotracheal tube has been placed with the tip terminating at the mid clavicular heads . Fullness and irregularity of the bilateral hila , aorticopulmonary window and azygos contour is accentuated by the low lung volumes . Linear horizontal atelectasis is noted at the right base . No effusion , pneumothorax or new consolidation is noted .
    OUTPUT:
    
1 . Appropriate position of ETT tube . 2 . Persistent mediastinal and hilar contour abnormalities represent multifocal lymphadenopathy or vascular enlargement . A chest radiograph can neither confirm nor exclude a pulmonary embolism . A chest CTA is still required to better assess the mediastinum .