Chronic pyelonephritis – pathology and pictures
1. In interstitium mostly on the border of cortex/medulla, are found focal infiltrations of lymphocytes and plasma cells.
2. Renal tubules are dilated and filled with pink protein casts resembling the follicular structures of thyroid gland – called ‘strumisation’ of parenchyma
3. Pericapsular glomerular sclerosis . Some kidney bodies are fully sclerosed.
In interstitium grows connective tissue, arterioles are with thickened walls and narrow lumens due to secondary hypertension.