Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Initial portable supine chest radiograph demonstrates an endotracheal tube within the right mainstem bronchus . Repeat AP radiograph through the chest demonstrates the distal tip of the endotracheal tube approximately 1 cm above the level of the carina . An enteric tube is identified descending the thorax in uncomplicated course , its tip which projects over the left upper quadrant in the presumed location of the gastric lumen . Gas distended loop of transverse colon is identified projecting over the right upper quadrant . A port is identified , its catheter tip which projects over the anticipated location of the low superior vena cava . Lung volumes are low with opacification at the left lung base likely secondary to partial collapse of the left lower lobe in the setting of right mainstem bronchus intubation . No focal consolidation convincing for pneumonia is seen . The heart border is obscured . There is no large pneumothorax . Probable small left pleural effusion . Osseous structures are without an acute abnormality .
    OUTPUT:
    
Initial radiographs demonstrate intubation of the right mainstem bronchus with repeat radiographs demonstrating the positioning of the endotracheal tube currently 1 cm above the level of the carina . For more appropriate placement , recommend retraction approximately 2 cm . Opacification of the left lower lobe with volume loss and leftward shift of mediastinal structures most compatible with partial left lower lobe collapse in keeping with right mainstem bronchus intubation .