Epidemiology, Diagnosis, Medical Care and Prognosis of Tubulointerstitial Nephritis: Results of a Multicenter Retrospective Cohort Study

Rereading of biopsies, blinded to the final diagnosis, by a pathologist specializing in nephropathology. This review includes: an optical microscopy study on a fragment fixed with routine staining, an optical microscopy study on a frozen fragment, an immunohistochemical study on a frozen fragment if available.

Collection of data from the patient's medical file. The clinical data of the care of patients at whom the biopsies belong will be analyzed until the date of the patient's last follow-up (before 12/31/2021).