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Pediatric Acute Liver Failure: A Clinicopathological Perspective
Juan Putra1,2, Vicky L Ng3, Antonio R Perez-Atayde4
1Division of Pathology, Department of Paediatric Laboratory Medicine, 7979The Hospital for Sick Children, Toronto, ON, Canada.
Insights
Pediatric acute liver failure (PALF) presents unique diagnostic challenges. This review details clinicopathologic evaluations and histopathology for identifying causes of PALF in children.
Area of Science:
- Pediatric Hepatology
- Pathology
- Clinical Medicine
Background:
- Pediatric acute liver failure (PALF) is a critical condition involving sudden liver damage in children without pre-existing liver disease.
- Diagnostic approaches for PALF differ significantly from adult cases, influenced by age, history, region, and presentation.
- A substantial proportion of PALF cases (30-50%) remain indeterminate even after thorough evaluation.
Purpose of the Study:
- To review the clinicopathologic characteristics of PALF.
- To emphasize the general approach to pathologic evaluation in PALF.
- To highlight histopathologic features of specific PALF entities.
Main Methods:
- Review of clinicopathologic features of PALF.
- Discussion of diagnostic considerations based on patient demographics and clinical presentation.
- Analysis of the role of liver biopsy in PALF evaluation.
Main Results:
- Diagnostic considerations for PALF vary by age, with distinct causes in neonates (e.g., gestational alloimmune liver disease, HSV infection, metabolic disorders) versus older children (e.g., acetaminophen toxicity, autoimmune hepatitis).
- Liver biopsy, though not routine, aids in determining etiology, injury mechanisms, transplantation suitability, and prognosis.
- A significant percentage of PALF cases remain without an identified cause.
Conclusions:
- Effective clinicopathologic evaluation is crucial for diagnosing PALF in children.
- Understanding age-specific etiologies and the utility of liver biopsy improves patient management and outcomes.
- Further research into indeterminate PALF cases is warranted.
Abstract:
Pediatric acute liver failure (PALF) is a life-threatening disorder characterized by acute hepatocellular injury occurring in children without recognized underlying liver disease. The clinicopathologic evaluation of PALF requires a different approach from that in adults. The diagnostic considerations differ depending on the age, personal and family history, geographical region, and clinical presentation. Distinct entities such as gestational alloimmune liver disease, herpes simplex virus infection, and metabolic disorders should be considered in neonates with acute liver failure, while acetaminophen toxicity and autoimmune hepatitis are more frequently seen in older children and adolescents. An identified cause for PALF despite a negative complete evaluation (indeterminate) is lacking in 30 to 50% of cases. Although not routinely performed in the setting of PALF, liver biopsy may be helpful in assessing the etiology, potential mechanisms of injury, determining the appropriateness of liver transplantation, and prognostication of the patients. In this article, we review the clinicopathologic characteristics of PALF with an emphasis on general approach of pathologic evaluation and histopathologic characteristic of selected entities.
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