[Focal nodular hyperplasia involving portal cavernoma]

Area of Science:

• Hepatology
• Pediatric Oncology
• Vascular Malformations

Background:

• Focal nodular hyperplasia (FNH) is a rare benign liver tumor, comprising only 2% of pediatric hepatic tumors.
• Portal cavernoma is a vascular malformation of the portal vein, often presenting with complications.
• Surgical intervention for portal cavernoma can have long-term implications on liver vasculature.

Observation:

• A teenager previously treated for symptomatic portal cavernoma developed multiple hepatic nodules.
• Imaging studies including CT scan and MRI suggested the presence of multiple FNH lesions.
• The unusual presentation and multiplicity of lesions prompted further investigation.

Findings:

• Diagnosis of multiple focal nodular hyperplasias was confirmed via surgical biopsy.
• The case presents an atypical manifestation of FNH in a pediatric patient with a history of portal vein intervention.
• Pathogenesis of FNH in this specific clinical context is explored.

Implications:

• This case expands the understanding of FNH presentation in children, particularly those with pre-existing vascular conditions.
• It underscores the importance of thorough diagnostic evaluation for multiple liver lesions, even in rare pediatric tumor types.
• Further research into the potential link between portal vein interventions and FNH development may be warranted.