Images of a bovine kidney were submitted, meat inspectors said this is a fairly common lesion in animals older than 12 months, but also in calves.

This pictures are characteristic of a subacute interstitial nephritis, also known as white spotted kidney.

This lesion is characterized by irregular whitish areas, of up to 1 cm in diameter in the renal cortex which do not normally protrude towards the renal capsule, extrend into the parenchyma and are non suppurative. When the lesion is more chronic the kidney surface becomes rugous and even shows areas of parenchymal retraction. This is a fairly nonspecific lesion but has been associated with infections by Escherichia coli, Leptospira spp. or other bacteria.

A similar lesion was published a couple of years ago in sheep.

Kidney with whitish spots of miliary distribution.

Kidney with whitish spots of miliary distribution.

View of the other side of the organ.

View of the other side of the organ.

Lesion detail.

Lesion detail.