Hydronephrosis

Unilateral or bilateral hydronephrosis is a relatively common finding in laboratory mice. It is usually

FIG. 1.120. Chronic nephropathy in an aged mouse.

regarded as an incidental finding, particularly if only one kidney is involved. Hydronephrosis can occur in high prevalence among certain strains or lines of mice or be secondary to urinary obstruction or pyelonephritis.