The ultrasonographic medullary "rim sign" versus medullary "band sign" in cats and their association with renal disease.

Background: Medullary rim sign (MRS) refers to a hyperechoic line in the renal medulla, reported on ultrasound examination (US) in both dogs and cats with and without kidney disease (KD).

Objective: To describe the different aspects of MRS in cats and to assess its association with KD.

Animals: Cats that underwent US examination, with MRS (study group) with and without KD and without MRS with and without KD (control groups).