Small Animal Radiology and Ultrasound: A Diagnostic Atlas and Text

Chapter Three The Abd omen 389
A
B
Fig. 3-169 Transverse (A, E, and F)
and longitudinal (B to D) sonograms
of the right kidney of a 4-
year-old castrated male Siamese cat
with a history of polyuria, polydipsia,
and palpably enlarged kidneys.
The renal pelvis is markedly dilated
(arrows). The kidney is enlarged,
irregularly shaped, and contains
both hyperechoic and hypoechoic
regions. This is indicative of infiltrative
renal disease. Diagnosis:
Lymphoma.
C
D
E
F
Fig. 3-170 Transverse (A) and longitudinal
(B) sonograms of the left
kidney of a 9-year-old castrated male
cat with a history of anorexia, weight
loss, and icterus of 1 month duration.
The kidney is diffusely hyperechoic.
This is indicative of
inflammatory or infiltrative renal
disease. Diagnosis: Lymphoma.
A
B
cycle. These include velocity (peak as well as spectrum), direction, and periodicity. The
moving objects assessed by Doppler blood flow techniques are the red blood cells. Doppler
ultrasonographic techniques have been applied to the assessment of canine and feline renal
disease. 502-510 There are numeric relationships, such as resistive index and pulsatility index,
between renal blood flow velocities in systole versus diastole that have been applied to the
assessment of renal parenchymal disease, including renal transplants. The utility of
Doppler techniques and related indices varies among those using them, but an increased
resistive index may aid in the assessment of the relevance of diffuse, infiltrative renal disease.
Similarly, a normal resistive index may be an encouraging finding in some patients
with acute renal failure and may eliminate the need for further assessments.