Objective—To determine prevalence and radiologic
and histologic appearance of vesicourachal diverticula
in dogs without clinical signs of urinary tract disease.
Animals—50 dogs between 4 months and 17 years
old representing 22 breeds that had been euthanatized
for unrelated reasons; none of the dogs had a
history or clinical signs of urinary tract disease.
Procedure—Retrograde positive-contrast radiography
was performed, and radiographs were examined for
macroscopic diverticula. Necropsy specimens from
the urinary bladder vertex were examined by means
of light microscopy for diverticula and signs of inflammation.
Results—17 of the 50 (34%) dogs had vesicourachal
diverticula, and 1 additional dog had a urachal cyst.
Fifteen of the 17 diverticula were macroscopic; surface
area of the diverticulum could be measured radiographically
in 13 of these dogs and ranged from 1 to
90 mm2. The remaining 2 diverticula were microscopic.
Sixteen diverticula were intramural and 1 was
extramural. Light microscopic signs of bladder wall
inflammation could be detected in 5 dogs, 4 of which
had macroscopic diverticula.
Conclusions and Clinical Relevance—Results suggest
that a high percentage of dogs without clinical
signs of urinary tract disease may have vesicourethral
diverticula. Further studies are needed to determine
the clinical relevance of vesicourethral diverticula in
dogs. (J Am Vet Med Assoc 2005;226:383–386)