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Small Animal Radiology and Ultrasound: A Diagnostic Atlas and Text

Small Animal Radiology and Ultrasound: A Diagnostic Atlas and Text

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Chapter Three The Abd omen 361<br />

Fig. 3-131 A 5-year-old female<br />

Siamese cat with anorexia <strong>and</strong> vomiting<br />

for 4 days. A <strong>and</strong> B, The kidneys<br />

are bilaterally enlarged <strong>and</strong> regularly<br />

shaped. Differential diagnoses<br />

include lymphoma, FIP, bilateral<br />

obstructive nephropathy, perirenal<br />

cysts, bilateral renal tumors, acute<br />

pyelonephritis, or polycystic renal<br />

disease. Diagnosis: Perirenal cysts.<br />

A<br />

B<br />

Density Changes. Changes in renal density also may be seen. Renal parenchymal mineralization<br />

may occur as a result of primary nephrocalcinosis, osseous metaplasia or dystrophic<br />

calcification of a neoplasm, infarct, or abscess. 193,467 Primary nephrocalcinosis may<br />

be associated with disorders of calcium <strong>and</strong> phosphorus metabolism such as hypervitaminosis<br />

D, primary or secondary hyperparathyroidism, excess or unbalance of calcium <strong>and</strong><br />

phosphorus in the diet, <strong>and</strong> Cushing’s disease. Osseous metaplasia has been described in<br />

association with hydronephrosis. Nephrocalcinosis also may result from chronic renal failure<br />

as well as being a cause of chronic renal failure. These conditions usually cause the

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