Page 448 - Feline diagnostic imaging

460 27 Urinary Disease

(a) (b)

(d)

(c)

(f)

(e)

Figure 27.6 Imaging of hydronephrosis. (a) Ultrasonography of a 9-year-old domestic longhair showed marked dilation of the renal
pelvis (1.58 cm). The length of the kidney was normal at 3.57 cm but there was very little remaining parenchymal tissue. (b)
Ultrasonography shows dilation of the proximal ureter extending from the renal pelvis (arrow). (c) Ultrasonography of an 11-year-old
domestic longhair found vocalizing and straining in the litter box. There was marked dilation of the left renal pelvis with minimal
remaining parenchymal tissue. Arrows indicate remnants of the pelvic diverticula. The left ureter was dilated and contained a calculus.
(d) An 8-year-old domestic shorthair had a calculus in the right ureter resulting in severe hydronephrosis of the right kidney (shown here),
which measured 2.69 cm long. The left kidney had a renal calculus and multiple chronic infarcts. (e) Early cases can be difficult to
differentiate from pyelonephritis as pyelonephritis usually causes less severe dilation of the pelvis. This 11-year-old domestic longhair
had a calculus near the urinary bladder. The left kidney was enlarged at 4.8 cm. In this image, the dorsal and ventral branches are
distended. (f) The proximal ureter of the left kidney of the cat in (e) was dilated at 0.6 cm.