Abstract
Palmer (1964) reported the esophageal marking by silver brain clip. The rigid esophagoscope was adequate for the manipulation of these clips because of its wide lumen. The biopsy canal of the esopha-gofiberscope was small about 3 mm in size, so the use of the big forceps was impossible. The special injector through the biopsy canal of the esophago-fiberscope was devised. The radiopaqne substances, such as tantalum tips, were injected into the sub-mucosal layer of the esophagus. The injector was 2.5 mm in size and the tantalum tip packed into the needle was pushed out by the mandolin of the needle. The clinical application of the esophageal marking was the diagnostic co-working with the radiology and the decision of the irradiations field in the cobalt therapy.
