Gastric Cancer

Endoscopic ultrasound (EUS) is frequently employed for the diagnosis and staging of gastric cancers and lymphomas. This chapter reviews EUS imaging and staging of these malignancies. The majority of gastric malignancies are adenocarcinomas. Diffuse-type adenocarcinoma are poorly differentiated tumors that infiltrate the stomach wall. The stomach is the most common site for primary extranodal lymphoma, comprising one-fourth of all extranodal cases and at least half of all primary gastrointestinal (GI) lymphomas. Tumors confined to the GI tract are stage IE, and these patients have significantly higher survival rates than those with lymph node involvement or distant spread. Endoscopic ultrasound evaluation of suspected gastric malignancies should include a thorough search for metastatic lymph nodes, especially in the perigastric, celiac, and gastrohepatic regions. This chapter contains a large collection of color images obtained from both diagnostic and therapeutic procedures.