Can a ct scan detect esophageal cancer and stomach cancer?

Neither esophageal nor stomach cancer can always be detected on a CT scan, especially if early stage. But, seeing a GI doctor and getting an upper endoscopy, where a lighted scope with a camera is passed into the esophagus and stomach, is the best way to detect these cancers. If an abnormality is found in either the stomach or esophagus, a biopsy can be taken to see if cancer is present. Good luck

It may, not always, suboptimal test for early stages, commonly used for staging and surveillance along with direct visualization through upper endoscopy.