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对１０５例胃前壁癌和３９例结肠局部癌双对比造影（ＤＣ）远地壁影像作了临床研究和１４９例切除标本的ＤＣ实验观察，发现病变在远地壁位或同时累及侧壁时的２个特征性表现：雾滴征和多边征。在本组胃和结肠癌中，雾滴征的出现率分别有１００例（９５％）和３８例（９７％）；多边征在７２例累及大弯或小弯的胃前壁癌中有７０例（９７％），在结肠癌中有３５例（８７％）；论证了此二征形成的物理和病理基础。
A double-contrast contrast (DC) remote wall image of 105 cases of anterior gastric carcinoma and 39 cases of colon cancer was studied clinically and 149 specimens of DC specimens were observed. It was found that the lesion was located in the distal wall or at the same time involving the lateral wall. The two characteristic manifestations: fog signs and multilateral signs. In this group of gastric and colon cancers, the incidence of fog signs was 100 (95%) and 38 (97%), respectively; the multi-lateral sign had 70 in gastric anterior wall cancers that involved large or small curvatures. Cases (97%) had 35 cases (87%) of colon cancer; the physical and pathological basis for the formation of the two signs was demonstrated.