Pedunculated mesenchymal hamartoma of the left lobe of liver in a 3-year-old child: a case report

Hepatic mesenchymal tumor is a rare benign pediatric hepatic tumor, typically presenting in children less than 2 years of age. Although it has a variable imaging appearance, and favorable prognosis if diagnosed and managed correctly. A 3-year-old male patient presented with abdominal distension, a large abdominal mass with rapid evolution over four weeks, and poor weight gain. His family and medical history were unremarkable. Imaging studies revealed a large solid-cystic mass arising from the left lobe of the liver. Laboratory parameters were within normal limits. He underwent exploratory laparotomy; careful dissection was undertaken to mobilize the left lobe. The left hepatic artery, portal vein, and left hepatic duct were meticulously isolated and controlled. The tumor was removed intact while preserving the surrounding liver parenchyma. Macroscopic and histological examination described an 18 × 13 × 6 cm multicystic mass consistent with mesenchymal hamartoma of the liver (MHL). The patient remains well at 5-month follow-up, with no evidence of lesion recurrence. Mesenchymal hamartoma should be included in the differential diagnosis of hepatic masses in children. Complete resection is curative.