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©2013 UpToDate ® Print Email Achalasia PA and lateral chest x-rays from a patient with achalasia. The major findings are a widened mediastinum caused by the dilated esophagus, an air-fluid level in the upper chest due to retained fluid in the dilated esophagus (arrows), and absence of the gastric air bubble. Reproduced, courtesy of the Clinical Teaching Project of the American Gastroenterological Association©. This slide cannot be downloaded but may be purchased as part of a set from the AGA through Milner-Fenwick, Inc. at 1-800-432-8433. Normal chest radiograph Posteroanterior view of a normal chest radiograph. Courtesy of Carol M Black, MD.