PT - JOURNAL ARTICLE AU - Yi Lin Lee AU - Siying Pang AU - Caroline Ong TI - Non-cirrhotic hyperammonaemia: are we missing the diagnosis? AID - 10.1136/bcr-2019-233218 DP - 2020 Mar 01 TA - BMJ Case Reports PG - e233218 VI - 13 IP - 3 4099 - http://casereports.bmj.com/content/13/3/e233218.short 4100 - http://casereports.bmj.com/content/13/3/e233218.full SO - BMJ Case Reports2020 Mar 01; 13 AB - Hepatic encephalopathy secondary to hyperammonaemia is a known complication of chronic liver disease. In contrast, non-cirrhotic hyperammonaemia is a lesser-known entity that should be considered in a patient with acute encephalopathy as part of the diagnostic workup as prompt identification can help to avoid complications such as seizures and cerebral oedema. We present a case of a middle-aged woman who presented electively for a total pancreatectomy–duodenectomy with splenectomy, hepatico-jejunostomy, gastro-jejunostomy and developed encephalopathy on postoperative day 10 due to non-cirrhotic hyperammonaemia.