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Evaluation of Renal Biopsy for Transplant: The Significance of Whole Slide Imaging (WSI) in Telepathology

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Percutaneous Renal biopsy remains a gold standard technique to provide diagnostic and prognostic information post kidney transplantation. Recently Whole slide imaging (WSI) telepathology systems have been widely used for clinical,… Click to show full abstract

Percutaneous Renal biopsy remains a gold standard technique to provide diagnostic and prognostic information post kidney transplantation. Recently Whole slide imaging (WSI) telepathology systems have been widely used for clinical, education and research purposes. Our aim was to examine reliability and accuracy of WSI telepathology service in the pathology diagnosis of biopsy specimens from transplanted kidney. At our institution we have two renal pathologists. They utilize WSI telepathology service with Aperio scanner for rapid initial assessment of the transplant renal biopsy specimens. We retrospectively reviewed reports of all transplant renal biopsies which were examined remotely utilizing WSI telepathology service and compared the results for initial versus final diagnoses. In period from Jan 2019 to April 2020 total 160 renal transplant biopsies were evaluated remotely utilizing the WSI scanner. The diagnosis was divided in 4 subcategories as reperfusion injury, rejection (Antibody mediated or T cell mediated), mixed inflammation-favor infection and Polyoma virus infection. There were 48 cases of reperfusion injury; 5 cases of polyoma virus infection, 37 cases of rejection and 28 cases with mixed inflammation and 42 cases with no significant histopathologic findings. There was no discrepancy between the preliminary and final diagnosis for all 160 cases. The ancillary studies including special stains and electron microscopy added to the final diagnosis or confirmed the preliminary diagnosis. WSI telepathology is a reliable and simple method to rapidly review transplant kidney biopsies. The ability to transmit images from hospitals to pathologists with WSI scanner has the potential for not only an accurate assessment of the rejection but also for additional histopathological findings. Digital pathology enhances the clinical usefulness of immediate assessments of transplant biopsy samples and also provides a platform to share the scanned images with clinicians which also can be utilized for education of trainees.

Keywords: diagnosis; renal biopsy; wsi telepathology; pathology

Journal Title: American Journal of Clinical Pathology
Year Published: 2020

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