Emphysematous pancreatitis is a rare variant of necrotizing pancreatitis and can be detected easily on computed tomography (CT). In stable patients, surgical intervention is likely to be delayed until conservative management has been attempted and has failed. Rapidly deteriorating manifestations and gas bubbles in and around the pancreas on CT are findings suggestive of infected pancreatic necrosis, and early necrosectomy may be indicated in such cases. We herein report the case of a 61-year-old woman with a history of diabetes mellitus and gallstones who presented with general soreness, vomiting, decreased urination, and abdominal fullness for three days. The findings on CT suggested a diagnosis of emphysematous pancreatitis. Hence, vigorous fluid resuscitation and intravenous meropenem administration were started immediately. The patient received a laparotomy and focal necrosectomy with closed lesser sac lavage and drainage on the next day. She recovered successfully and was discharged after one month. The early presence of gas in and around the pancreas on CT possibly implies secondary infection, and in such cases, surgical intervention should be considered.