<prompt> This patient presented with chest pain. What is the diagnosis?Acute pulmonary embolismHypertrophic cardiomyopathyAscending aortic aneurysmCoarctation of the aorta  <response>: Answer C. Ascending aortic aneurysmA widened mediastinum is visible on chest radiography. The patient was diagnosed with a 9.5-cm ascending aortic aneurysm. 