[en] In order to obtain preoperative data on the regional lymph nodes in 21 cases of esophageal or cardiac cancer, lymphoscintigraphy was performed by the sophageal submucosal injection of technetium 99m-renium colloid. Of 289 surgically resected lymph nodes, 68 were visualized on scintigrams, and 17 (25%) of them showed metastasis. Nine (4.1%) of 221 non-visualized lesions showed metastasis. In cases in which RI was also administrable to the anal side of tumor, intraperitoneal lymphnodes were visualized. The method proved effective for the preoperative prediction of possible lymphnode metastases. (Chiba, N.)