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Maierl, Johann (1997): Differences in the renal pelvic epithelium of dog and cat - histologic and scanning electron microscopic findings and their possible clinical significance. In: Wiener Tierärztliche Monatsschrift, Vol. 84, No. 7: pp. 199-203
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Abstract

Epithelium from the renal pelvis of dogs and cats was investigated by light and scanning electron microscopy. Apart from regular transitional epithelium, a different type of epithelial lining was found in both species. Superficial cells in th is type of epithelium were smaller and characterized by tightly packed, stub-shaped microvilli. Species-specific characteristics were found as to the localization of the two types of superficial cells: in the dog, most of the pelvicsurface is covered by,,microvillar cells’’, while regular transitional epithelium clearly prevails in the cat. In laboratory diagnosis an increased number of so-called ‘’renal epithelia’’ in the urinary sediment is, therefore, highly suggestive of renal inflammation in the cat, while it might only be a symptom of pyelitis in the dog. Due to their particular morphology, these ‘’microvillar’’ superficial cells might be responsible for an exchange at substances between the urine in the renal pelvis and the renal parenchyma, as physiological studies have indicated.