The previously described mass appears to have a pedicle that infiltrates towards the gastric wall and, therefore, is favoured gastric in origin. Although the mass abuts against the pancreatic tail, it appears to be a fine rim of fat between them. The lesion has lobulated contours, and is mostly solid with enhancement. The low attenuation foci on CT correlate with cystic content with elevated T1 signal, likely hemorrhagic/necrotic.
The pancreas has otherwise normal morphology, signal intensity, and enhancement. There is no dilatation of the main pancreatic duct. There is no biliary tree dilatation, the gallbladder is normal. The liver has normal signal intensity and enhancement, no focal lesions. The adrenal glands, spleen, and kidneys are normal. There is no lymphadenopathy or free fluid within the superior abdomen.
Conclusion: The previously identified mass is favoured to be gastric in origin and, therefore, GIST is the main consideration.