Diagnosis of rectal cancer by intraoperative ultrasonic echography with special reference to the depth of invasion and lymph node metastasis.

概要

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It is essential to recognize the local extension of rectal cancer for choosing an adequate operative procedure. 10 cases of rectal cancer were studied by ultrasonic echography during surgery for obtaining the diagnosis of the local extension. The rectal wall was visualized to four layers by this method. The depth of invasion was determined by the degree of destruction of the four layers. The invasion of adjacent organs was clearly visualized without interference of the ultrasound by the cancer. Lymph nodes were examined along the superior rectal and bilateral iliac vessels and this scanning led to the correct location of the lymph nodes. We found hyperechoic spots in the lymph nodes, corresponding to cancerous nests with central necrosis histologically. The hyperechoic spot is useful as a sign of lymph node metastasis of rectal cancer.
日本大腸肛門病学会の論文