Outcome of TAMIS Mucosal Resection in Patients With ODS

Inclusion Criteria: * Need of minimal invasive mucosal resection due to obstructed defecation syndrome after several unsuccessful conservative treatments over a period of more than 6 months with presence of an organic cause (Symptomatic intussusception with or without rectocele) in medical examinations (defecography, endoluminal ultrasound, endoanal manometry) * Age: 18-90 years * Ability and willingness to understand and comply with planned interventions during the study. * Voluntarily signed informed consent after a full explanation of the study to the participant. Exclusion Criteria: * Any physical or mental disorder could interfere with the participant's safety during the clinical trial or with the study objectives. * Inability to communicate well with the investigator due to language problems or reduced mental development. * Inability or unwillingness to give written informed consent.