Case Study

Renal calculi in a 5 year old MN DMH cat

A 5-year-old male neutered DMH cat was presented for evaluation of PU/PD, abnormal behavior, and inappropriate urination (periuria). Low-normal specific gravity (1.014) was evident on urinalysis. CBC was within reference range, but serum biochemistry revealed azotemia.

Sonographic Differential Diagnosis

This patient has renal calculi, and is likely passing calculi intermittently from the kidneys to bladder. Secondary degenerative renal changes with cortical infarcts are also noted in the kidneys. The movement of the calculus may be responsible for the cortical infarct.

Image Interpretation

An accumulation of calculi was noted in the bladder and measured 1.0 cm. The calculi were non obstructive.
The right kidney presented a 0.4 cm pelvic calculus with distinct shadowing and slight pyelectasia. The right kidney measured 3.4 cm. Left renal calculus was also noted and measured 0.34 cm at the pelvis with a hyperechoic infarct at the caudal pole measuring 0.82 cm. Capsular retraction was noted dorsally and caudally in the left kidney, indicative of infarcts. The calculus in the left kidney was adjacent to the caudal infarct.