Safety and Efficacy of Endoscopic Full Thickness Biopsy in Patients With Chronic Intestinal Pseudo-obstruction

Inclusion Criteria: * Patients with chronic pseudo intestinal obstruction or suspected chronic pseudo intestinal obstruction * Patients who are 18 years of age or older at the time of obtaining consent * Gender: Any Exclusion Criteria: * Patients for whom it is difficult to perform endoscopy * Patients who cannot obtain consent * Patients with serious renal, hepatic, or cardiac disease * Patients who are participating in other clinical research, except for observational research. * Other patients whom the principal investigator or subinvestigator determines to be inappropriate to conduct this study.