Abstract
We developed an new intraluminal ultrasonography under romanoscopy. This instrument consisted of romanoscopy and the pistol type of intraluminal ultrasonograph (7.5MHz). The procedures were as follows : (1) romanoscope was inserted intrarectally, and the lesion of the colon was observed, (2) romanoscope was placed oral to the lesion and, then, ultrasonograph was inserted through romanoscope with airtight, (3) 150ml water was injected into the lumen through the romanoscope, and (4) lesion was observed through pulling out. The rectal wall was ultrasonographically recognized as five layers in its structure. This method can be performed satisfactorily even for twisted colon, because volume of the water could be easily controlable in a short period of time. The depth of involvement can be evaluated by assessing the destroyed layers of the wall structure. Correct diagnosis could be obtained in 21(80.8%) of the 26 patients with rectal cancers.
