Urinary System pp 306-309 | Cite as

Spontaneous Hydronephrosis, Rat

  • Robert R. Maronpot
Part of the Monographs on Pathology of Laboratory Animals book series (LABORATORY)


Cases of mild to moderate hydronephrosis are easily recognized on a midsagittally (Fig. 256) or transversely (Fig. 257) sliced kidney by dilation of the pelvocalyceal system. Distortion of the normal surface contour is usually not seen in moderately affected kidneys. However, the moderately hydronephrotic kidney may be slightly longer and wider than normal. While the amount of cortical tissue is normal, there is gross loss of medullary and papillary tissue associated with the pelvocalyceal dilation characteristic of moderate hydronephrosis. The decrease in renal tissue associated with moderate hydronephrosis may be accompanied by an increase, rather than the expected decrease, in kidney weight (Henderson et al. 1982).


Renal Pelvis Renal Papilla Hydronephrotic Kidney Unilateral Hydronephrosis Impaired Glomerular Filtration Rate 
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© Springer-Verlag Berlin Heidelberg 1998

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  • Robert R. Maronpot

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