Endoscopic ultrasonography in the assessment of intra- and transmural infiltration of tumours in the oesophagus, stomach and papilla of Vater and in the detection of extraoesophageal lesions.

摘要: Conventional ultrasonography is widely used as a diagnostic investigation in gastroenterology. Ultrasonically visible 'target or halo sign' caused by lesions the upper GI-tract has no specificity biological significance, so conventional cannot be an adequate for detecting GI-tract. Recently endoscopic was developed with aim of improving potentialities ultrasonography. Using ultrasonic device it now possible not only to detect GI-tract, but also assess exact extent and depth both local infiltration adjacent metastases. Rapid differentiation between intramural extraluminal can readily accomplished. The superiority this new technique diagnosis tumours papilla Vater, particular establishing preoperative tumour staging, been demonstrated comparison other imaging techniques. These preliminary results small number patients must confirmed further studies involving clinical trials large patients.