An English Bulldog is undergoing thoracic radiographs to look for megaesophagus. The following right lateral radiograph is obtained. What are your thoughts? <image 1>
['This dog has megaesophagus, and an upright feeding chair should be recommended.', 'This dog has extra mediastinal fat, and megaesophagus is not identified.', 'This dog has pulmonary edema in the cranial lung lobes, likely secondary to aspiration pneumonia.', 'This dog has a large volume pleural effusion, and a thoracentesis should be performed immediately.']