Chronic Pyelonephritis

Chronic Pyelonephritis •The photograph shows the renal papillary region of the medulla. •The top of the photograph shows transitional epithelium that lines the calyceal lumen. •The arrows point to collecting ducts. •There is chronic inflammation involving the parenchymal interstitium. (Description By:H. Yamase, M.D. ) (Image Contrib. by: UCHC )