Background: To propose a new method for the ultrasound study of the rectum.
Methods: Twenty-one healthy female patients, 58-72 years old, were examined. To achieve optimal filling and distention of the rectum, the examination was performed with the patient in the right lateral decubitus position. After placing the probe into the vagina, 1000-1500 mL of water warmed to 35 degrees C was introduced into the rectum through a cannula. After the rectum was completely full, the cannula was extracted. Images were obtained before and after rectum distention on the transverse plane by using a 5.0-MHz convex radial endocavitary probe.
Results: Using water eliminated air and fecal artifacts, so rectal wall layers were reliably demonstrated, with the rectal ampulla well distended. In addition, the rectum in whole circumferential extension and the perirectum fat were clearly visualized.
Conclusion: This new method is useful for study of the rectum.