Authors present here in a calyceal diverticulum complicated by chronic pyelonephritis, which was diagnosed on urinalysis, IVP, RGP and symptoms. Partial nephrectomy was done and confirmation was made by specimen gross findings and biopsy. The microscopic findings are as follows: The lining epithelium of the inner surface of the cystically dilated calyx is made up of transitional epithelial cells. The epithelium in the areas is eroded. The subepithelial interstitial tissue is fibrotic and infilterated with large numbers of chronic inflammatory cells, which also invade the underlying renal parenchyma.
Biopsy ; Cytochrome P-450 CYP1A1 ; Diverticulum ; Epithelial Cells ; Epithelium ; Nephrectomy* ; Pyelonephritis ; Urinalysis