The ultrasonographic features of gastric wall lesions were studied in 40 patients and correlated with the CT [computed tomography] findings in 14. Features diagnostic of tumor included an infiltrative lesion causing thickening of the gastric wall, which can be localized or diffuse and smooth or irregular; a globular mass, nodular or irregular, poorly or irregularly echogenic or containing a necrotic cavity and a combination of both, resulting in a rather complicated configuration. Gastritis and gastric ulcers also cause thickening of the gastric wall, but to a lesser extent.