Abstract
Endoscopic ultrasonography (EUS) was performed on nine cases (eight primary and one secondary of gastric malignat lymphoma). Pathological specimen were obtained during surgery in six and by biopsy in two of the eight patients with gastric primary malignant lymphoma. When the efficacy of EUS in these nine patients was studied, the following results were obtained. (1) In the eight cases of gastric primary malignant lymphoma, comparatively homogenous low echos were obtained in the giant fold type (one case), protruded type (one case) and ulcerative type (two cases), an differentiation from gastric cancer and ulcer was possible using the echograms, but such differentiation was not possible in the superficial spreading type (three cases). (2) The depth of invasion could be correctly diagnosed in four of the six patients undergo in surgery. The one patient who was misdiagnosed had microinfiltration to the proper muscle layer which was confirmed by immunostaining using a monoclonal antibody. (3) Preoperative diagnosis was possible in one patient with lymph node metastasis. (4) In one patient with gastric secondary malignant, lymphoma, the presence of infiltration was confirmed only by EUS.
