Objective To investigate the safety and efficacy of islet transplantation after failed pancreas transplantation， and to summarize the literature experience. Methods The clinical data of 3 patients with islettransplantation after failed pancreas transplantation in the first Affiliated Hospital of Sun Yat-sen University wereretrospectively analyzed and followed up for 6 months.Results In the 3 patients who received islet transplantation afterfailed pancreas transplantation， the islet function was good after operation， the level of fasting C-peptide was significantly improved compared with that before surgery. All patients stopped using exogenous insulin or reduced the dosage by morethan 2/3， and their blood glucose was stable. Conclusion islet transplantation after failed pancreas transplantation canbe a remedial treatment for diabetes mellitus with high efficacy and safety. 

 Objective The incidence，pathological changes and differential diagnosis of commoncomplications after liver transplantation have been studied，through a retrospective analysis of the pathological dataof 209 liver transplant biopsy tissues from a single center. Methods A total of 209 biopsies were performed in145 patients with liver transplantation from August 2013 to April 2023, at the Organ Transplantation Center of the First Hospital of Jilin University. The liver tissues were fixed with 4% neutral formaldehyde solution， embedded in paraffin and sectioned continuously， routinely HE staining， Masson， D-PAS， reticular fiber histochemical staining， CK7， CMV， C4dimmunohistochemical staining and EBER in situ hybridization were performed. Results Acute T cell-mediated rejection （TCMR） was the most common （36.84%） complication， followed by drug-induced liver injury（DILI）（23.44%） and biliary complications （14.35%）， others include Hepatitis B and Hepatitis C virus infection or recurrence，ischemia-reperfusion injury， cytomegalovirus infection， chronic rejection， plasma cell-rich rejection， vascular complications， recurrent primary disease， primary graft dysfunction， and difficult-to-diagnose liver morphology. The diagnosis of acute T cell-mediated rejection was based on portal inflammation， bile duct inflammation and venous endothelial inflammation. In 58.44% cases of TCMR， the classic“Triad” of portal area was found. In DILI， there were swelling or ballooning degeneration of hepatocytes around central vein， steatosis with different degrees， cholestasis in hepatocytes and bile canaliculi. Biliary complication was characterized by cholestasis in hepatocytes and bile canaliculi， proliferation of small bile ducts along the interface of the portal tract，and interstitial edema.Conclusion The pathological diagnosis should be made after comprehensive analysisof the clinical manifestation， laboratory examination， imaging data and medication history. 

Objective To study the treatment of patients with acute respiratory distress syndrome（ARDS） caused by cytomegalovirus（CMV）pneumonia after renal transplantation. Methods A retrospective analysis of21 patients with ARDS caused by CMV pneumonia after renal transplantation in 4 years in the hospital was doneThe general situation，treatment and clinical outcomes were summarized and analyzed. All the 21 patients were treated with antiviral therapy，decreased the dosage of immunosuppressant，supported with active whole body supporttherapy，and applied with timely ventilation. Results In the 21 patients，the treatment of 16 cases was effectiveThree cases experience respiratory failure and died after active treatment. Two cases died after discharge not suggested by medical staff. The effective rate was 76.19%. All CMV antigen in peripheral blood turned negative after treatment. Of the 16 cases survived，12 cases experienced oliguria，serum creatinine（SCr）increased. Pulmonary function wasrecovered and SCr was gradually returned to normal along with the control of infection. The renal function of other4 cases remained normal. Conclusion CMV pneumonia accompanied ARDS should be treated by antiviral therapy，withdrawal of immuno-suppressant drugs，rebuild the body's immunity function，and timely application ofventilation, which are helpful to improve the successful remedy rate.