结肠气钡双重造影：乙状结肠及直肠上段向后受压变细。
The sigmoid colon and upper rectum were pressed backward and narrowed on colic photography.
目的观察乙状结肠直肠动脉在上段直肠的分支分布特点。
Objective To observe the characters of the branches of the sigmoid-rectal arteries.
47例直肠癌包括：3例上段直肠癌，4例中段直肠癌，40例下段直肠癌。
47 rectal carcinoma included: 3 in upper rectum, 4 in middle rectum, 40 in lower rectum.
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