Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single portable frontal chest radiograph demonstrates endotracheal tube at the level of thoracic inlet , in the upper airway . The esophagus is air-filled . The lungs are well inflated and clear lungs . Aerated lung is seen extending inferiorly at the left costophrenic angle . No pleural effusion or pneumothorax . Heart size , mediastinal contour , and hila are unremarkable . Limited assessment of the upper abdomen is within normal limits .
    OUTPUT:
    
1 . Endotracheal tube at the level of the thoracic inlet and the upper airway . Consider advancing 1 .5 cm for better positioning . 2 . Aerated lung extending inferiorly down the left costophrenic angle . Although this is not a deep sulcus sign if clinical concern for pneumothorax consider upright or decubitus radiograph for further evaluation .