Endoscopic Ultrasonography Diagnosis for Colorectal Diseases

We have used endoscopic ultrasonography (EUS) for all the colorectal diseases. For cancer, we determined the treatment method by evaluating the depth of cancer invasion. Moreover, we have applied EUS for submucosal cancer to decide whether the depth of submucosal invasion was superficial and thus to estimate the indication of endoscopic resection. Lymph node metastasis has been examined for staging in cases with invasive cancer. We have performed EUS for active ulcerative colitis in observing the depth of inflammation and determined treatment strategy by diagnosing clinical severity. Submucosal tumorous lesions and extramural lesions have been examined to clarify the site and inner condition. EUS is an essential method that leads to accurate diagnosis of any colorectal disease by delineating pathological conditions precisely. With improvement of the instrumentation, EUS can be used as a routine diagnostic tool as is colonoscopy.