Overview of Non-Cirrhotic Portal Hypertension in Pediatric Patients.

Non-cirrhotic portal hypertension (NCPHT) is defined as portal hypertension (PHT) occurring in the absence of cirrhosis. Major etiological causes of NCPHT include immunological disorders, chronic infections, exposure to medications or toxins, prothrombotic conditions, and several genetic syndromes, highlighting that NCPHT is not a single disease but a shared phenotype arising from diverse underlying pathways. NCPHT is frequently misdiagnosed, largely due to inconsistent nomenclature and limited scientific literature. The broader term non-cirrhotic portal fibrosis (NCPF) or porto-sinusoidal vascular disease (PSVD) includes patients in a preclinical stage who demonstrate histological features similar to NCPHT but lack clinical evidence of PHT. Early detection is linked to a favorable prognosis and improved clinical outcomes. Management strategies in pediatrics continue to rely on extrapolations from adult practice, with sparse evidence to guide pediatric care. Liver biopsy remains the cornerstone of diagnosis, demonstrating nodular regenerative hyperplasia, obliterative portal venopathy, or incomplete septal fibrosis. Management focuses on prophylactic and symptomatic care, with endoscopic therapy for controlling variceal bleeding. Porto-systemic shunts and, ultimately, liver transplantation therapies may be needed for advanced stages. A pressing need exists for standardized diagnostic criteria and multicenter studies to define natural history, refine risk stratification, and evaluate therapeutic approaches in the pediatric population. This review provides an overview of the pediatric causes of NCPHT, outlines the current understanding of pathophysiology, and discusses the clinical presentations and management strategies, while highlighting existing research gaps.