system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Locally invasive gastric carcinoma. Investigation of choice to know depth of cancer invasion:
assistant
The correct answer is  The best way to stage the tumor locally is EUS, which gives fairly accurate (80%) information about the depth of tumor penetration into the gastric wall, and can show enlarged (>5mm) perigastric and celiac lymph nodes