A STUDY ON WALL STRUCTURE OF THE COLON AND EARLY SUPERFICIAL CANCER BY 20MHz ULTRASONOGRAPHY

Abstract

Endoscopic ultrasound probe system named Sonoprobe System SP-101 (20MHz) (Fujinon. Co) was applied for the study of colorectal tumors, particularly early superficial cancer. The subjects were 32 specimens for experimental study and 50 patients with colorectal lesion (14 early superficial cancer). In the endoscopic ultrasonographic imaging, the colonic wall structure was divided into 9 layers. The lst-3th layers corresponded to the mucosa, the 4th layer to the muscularis mucosa, the 5th layer to the submucosa, the 6-8th layers to the muscularis propria, and the 9th layer to the serosa or adventitia. Accordingly we determined mucosal or submucosal cancer by judging whether the 4th layer was preserved or not. Based on this, the depth of cancer invasion was accurately diagnosed in 100% (14/14). The system was proved to be very useful for the diagnosis of depth of invasion in early superficial cancer.