Detecting GIST tumors by radiological methods is not always easy, especially if the tumor is small. Although the tumor size accounts for a prognostic factor , as known, tumor size is not an indicator of malignancy, even so larger tumors are more often malignant. Radiological imaging is not a first-line choice, since gastroscopy is recommended as the first examination in suspicion of a gastric disorder. Symptomfree appearence rearly indicates gastroscopy, however – rather as an incidental finding – a very tiny GIST can be sometimes detected.