A. MichalopoulosV.N. PapadopoulosG. BasdanisE. HaralabopoulosA. ZatagiasS. Netta S. ApostolidisE. Fahantidis Colorectal gastrointestinal mesenchymal tumours. Report of a stromal case of the rectum (GIST) and a leiomyosarcoma of the transverse colon