Hepatic cystic hamartoma, also named Mesenchyma hamartoma of liver, is a rare benign liver tumor of childhood, usually before the age of 2, of mesenchymal origin and variable clinical presentation (abdominal dissension, abdominal mass, pain, vomiting and signs of inferior vena cava compression).

A disordered proliferation of mature tissues that is native to the site of origin, e.g., exostoses, nevi and soft tissue hamartomas. Although most hamartomas are benign, some histologic subtypes, e.g., neuromuscular hamartoma, may proliferate aggressively such as mesenchymal cystic hamartoma, Sclerosing epithelial hamartoma, Sclerosing metanephric hamartoma.