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Veterinary Pathology, Vol 20, Issue 6 662-669, Copyright © 1983 by American College of Veterinary Pathologists

ARTICLES

Renal medullary crest necrosis associated with phenylbutazone therapy in horses

W. K. Read

Thirty-five cases of renal medullary crest necrosis morphologically similar to the renal papillary necrosis of analgesic nephropathy as described in man and rats are reported in horses receiving maintenance dosages of phenylbutazone. The primary lesion is a well-demarcated focal medullary necrosis resulting in sequestration of fragments of the renal crest. Renal cortical lesions are considered secondary to the medullary necrosis and consist of segmental pallor as a result of tubular dilatation, filtrate retention, and interstitial edema. Ischemia in concert with phenylbutazone is suggested as the etiology. Renal medullary crest necrosis is presented as more appropriate morphological terminology for this lesion in the equine species than renal papillary necrosis as is used in man and rats.




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Copyright © 1983 by the American College of Veterinary Pathologists.