超音波内視鏡による食道癌診断

Diagnosis of Esophageal Cancer by Means of Endoscopic Ultrasonography

要旨　リニア電子走査式超音波内視鏡による食道癌の深達度およびリンパ節診断について検討した．基礎的検討では食道壁は7層に描出され，リンパ節は転移の有無によらずhypoechoicに描出された．臨床例での深達度診断は，通過例で83.3％の診断率であった．長径5mm以上のリンパ節の描出率は前期27.6％，後期57.9％であった．また長径5mm以上のリンパ節の領域別存在診断率は前期52.0％，後期79.1％であった．本法は食道癌の術前診断法として有用と思われた．

　An investigation was conducted on the depth of invasion of esophageal cancer as well as on the diagnosis of the lymphonodi through electronic linear array endoscopic ultrasonography.

　The delineation of seven layers in the esophageal wall and the visualization of the lymphonodi as hypoechoic areas independently of the presence of metastasis was concluded from the basic studies.

　The rate of diagnosis of the depth of invasion of esophageal cancer was of 83.3% in the cases capable of being crossed by the ultrasonic endoscope. Considering the lymphonodi over 5 mm in the largest diameter, the rate of visualization was of 27.6% in the early period and of 57.9% in the late period. Besides, the rate of diagnosis of the presence of the lymphonodi over 5 mm in the largest diameter in the different areas was of 52.6% and 79.1% in the early and late period, respectively.

　It is thought to be a very useful preoperative di-agnostic method of esophageal cancer.