Important pertinent negatives that need mentioning are:
absence of free peritoneal air
absence of portal venous gas
absence of pneumatosis intestinalis or mediastinal emphysema
no NG tube and no history of gastroscopy
Gastroenterology and/or surgery consult important to monitor clinical progress as it is not possible to differentiate emphysematous gastritis from the more benign gastric emphysema.
Urinary tract calculi and hydronephrosis require further investigation.