The study validates prospectively a new endoscopic scoring system (Gothenburg Intestinal Transplant Endoscopy Score, GITES) designed to summarize and stratify the abnormal ileal endoscopic findings after intestinal transplantation. GITES is a five-tier, four grade score which asseses mucosal friability, mucosal erythema and mucosal injury (ulcerations) as well as villous changes according to severity. These features (i.e., endoscopic descriptors) are also grouped from mild to very severe in the same sequence as observed during the progression of several pathologic conditions encountered after intestinal transplantation (acute rejection, infectious enteritis).

Inclusion Criteria:

• transplantation of a segment of small intestine (as isolated graft or together with other organs)

Exclusion Criteria:

• contraindications for ileoscopy

All patients (pediatric or adult) undergoing intestinal transplantation (isolated intestine, liver-intestine, multivisceral, including colon or other organs) irrespective of diagnosis; patients already transplanted can also be included.