What is the etiopathogenesis of ureteral obstruction in cats?

Obstruction can develop secondary to intraluminal obstruction, parietal ureteral lesion, or extraluminal compression.

In cats, ureteral obstruction is mainly due to the small internal diameter of their ureter.

Approximately 98% of cases of ureteral lithiasis in cats are due to calcium oxalate stones.

The prognosis for recovery of renal function depends mainly on the degree and duration of obstruction.