# Large Mesenchymal Hepatic Hamartoma in Pediatric Age: A Case Report

## TL;DR

This case report describes a rare large benign liver tumor in a young child and the surgical treatment performed.

## Contribution

The novelty lies in presenting a detailed clinical case of a large hepatic mesenchymal hamartoma in a pediatric patient.

## Key findings

- Mesenchymal hamartoma was diagnosed in a 1-year-and-9-month-old boy with a large liver lesion.
- The tumor was successfully treated with an extended right hepatectomy and cholecystectomy.
- Imaging confirmed a multiloculated septated lesion measuring 13.6 × 17.7 cm.

## Abstract

Benign liver tumors are infrequently observed in the pediatric age group, with an incidence reported at 0.7 per million population annually. Among these tumors, mesenchymal hamartoma constitutes 18%–29%. Imaging studies commonly reveal a well-marginated, solitary mass, often measuring up to 30 cm. The mass, primarily located in the right liver lobe (75% of cases), may exhibit a pedunculated structure. We present a case of a 1-year-and-9-month-old boy diagnosed with hepatic mesenchymal hamartoma. A contrast-enhanced computed tomography of the abdomen and magnetic resonance imaging (MRI) were performed and demonstrated a large multiloculated septated liver lesion measuring approximately 13.6 × 17.7 cm, demonstrating multiple partially thickened internal septations. The procedure was done for the patient in the form of an extended right hepatectomy with segment 4A and cholecystectomy.