CLINICAL SIGNIFICANCE OF RENAL PELVIC DILATATION ON ULTRASOUND IN DOGS AND CATS
Article first published online: 18 AUG 2010
© 2010 Veterinary Radiology & Ultrasound
Veterinary Radiology & Ultrasound
Volume 52, Issue 1, pages 88–94, January/February 2011
How to Cite
D'ANJOU, M.-A., BÉDARD, A. and DUNN, M. E. (2011), CLINICAL SIGNIFICANCE OF RENAL PELVIC DILATATION ON ULTRASOUND IN DOGS AND CATS. Veterinary Radiology & Ultrasound, 52: 88–94. doi: 10.1111/j.1740-8261.2010.01729.x
- Issue published online: 6 JAN 2011
- Article first published online: 18 AUG 2010
- Received January 22, 2010; accepted for publication June 18, 2010.
- renal pelvis;
Renal pelvic dilatation is often recognized sonographically in dogs and cats, but ranges of measurements expected with different urologic conditions remain unknown. Ultrasound images of 81 dogs and 66 cats with renal pelvic dilatation were reviewed, and six groups were formed based on medical records: (I) clinically normal renal function, and (II) clinically normal renal function with diuresis; (III) pyelonephritis; (IV) noninfectious renal insufficiency; (V) outflow obstruction; (VI) miscellaneous nonobstructive anomalies. Medians for maximal pelvic width (range) for group I was 2.0 mm (1.0–3.8) in 11 dogs, and 1.6 mm (0.8–3.2) in 10 cats; for group II, 2.5 mm (1.3–3.6) in 15 dogs, and 2.3 mm (1.1–3.4) in 16 cats; for group III, 3.6 mm (1.9–12.0) in nine dogs, and 4.0 mm (1.7–12.4) in seven cats; for group IV, 3.1 mm (0.5–10.8) in 33 dogs, and 2.8 mm (1.2–7.3) in 13 cats; for group V, 15.1 mm (5.1–76.2) in six dogs, and 6.8 mm (1.2–39.1) in 17 cats; and for group VI, 3.8 mm (1.2–7.6) in seven dogs, and 3.0 mm (1.3–7.5) in three cats. Pelvic width in group I was lower than in groups III–V (P=0.0001), but did not significantly differ from group II. Pelvic width ≥13 mm always indicated obstruction. While the proportion of bilateral pelvic dilatation was not different among groups, the difference in pelvic width (maximal–minimal) was greater in group V vs. groups I, II, and IV (P=0.0009). These results confirm that renal pelvic dilatation can be detected sonographically in dogs and cats with clinically normal renal function, and that it increases with renal insufficiency, pyelonephritis, or outflow obstruction. Nevertheless, renal pelvic width varies substantially within groups and should be interpreted with caution.