After oral administration of 250 ml mannitol 3 days before admission, yellow sparse defecation occurred 4-5 times. However, the abdominal distention became significantly worse, and the patient stopped defecating and passing gas 2 days before admission. Due to these symptoms, the patient attended the Department of Gastroenterology in the Bethune International Peace Hospital. Since the onset of the disease, the patient had consumed a poor diet and had lost 6 kg of body weight.