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‘All that glitters is not gold’: when hyperammonaemia is not from hepatic aetiology
  1. Abubaker A.I. Hassan,
  2. Walid Ibrahim,
  3. Ahmed Subahi,
  4. Abdelaziz Mohamed
  1. Internal Medicine, Wayne State University, Detroit, Michigan, USA
  1. Correspondence to Dr Abubaker A.I. Hassan, abhassa{at}


Hyperammonaemia is often caused by decompensated liver disease. However, non-hepatic causes can sometimes result in hyperammonaemia, severe enough to cause symptoms.

We report a case of a 65-year-old man with a history of hypertension and bilateral peripelvic renal cyst who presented with acute confusion. Laboratory investigations revealed hyperammonaemia and normal liver function test. The abdominal ultrasound did not reveal any finding of liver disease or portal-systemic shunting but demonstrated bilateral peripelvic cysts with no hydronephrosis.

Hyperammonaemia was attributed to urinary tract infection with a urea-splitting Escherichia coli bacterium.

Antibiotic therapy and lactulose were administered. His neurological status rapidly normalised over the next 48 hours, concomitantly with a decrease in ammonia level. Clinician awareness of non-hepatic causes of hyperammonaemic encephalopathy like urinary tract infection can contribute to early diagnosis and timely initiation of appropriate and potentially life-saving treatment including antimicrobial therapy, alleviating urinary obstruction, if present, and lactulose.

  • Gastrointestinal system
  • Infections
  • Urinary and genital tract disorders

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  • Contributors AAH provided critical revision of the manuscript and contributed in intellectual content. WI drafted the manuscript. AS contributed in administrative, technical and material support. AM did literature review and referencing.

  • Competing interests None declared.

  • Patient consent Obtained.

  • Provenance and peer review Not commissioned; externally peer reviewed.

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