Late hepatic metastasis in the evolution of gastrointestinal stromal tumors.

Gastro-intestinal stromal tumours develop in the digestive tract wall, in the undifferentiated mesenchymal cells with a starting point at the level of the interstitial cells of Cajal. Gastro-intestinal stromal tumours often lead to peritoneal and hepatic metastasis. Assessment of aggressive behavior of GIST is difficult.