Diagnosis of Ménétrier's Disease

Ménétrier's disease is diagnosed through x rays, endoscopy, and biopsy of stomach tissue. Endoscopy involves looking at the inside of the stomach using a long, lighted tube that is inserted through the mouth. Biopsy involves removing a tiny piece of stomach tissue to examine under the microscope for signs of disease.

source: http://digestive.niddk.nih.gov/ddiseases/pubs/menetrier/index.htm