In a male, 4 months old, organic chicken carcass an increase in the size of the kidneys was observed, along with pale discolouration and numerous irregular yellowish nodules.

Microscopically, the kidneys showed areas with extensive multifocal necrosis along with radialy structured crystals corresponding to tophi (monosodium urate salts deposits) accompanied by a granulomatous inflammatory infiltrate . It is, therefore, a case of visceral gout.

Birds have a special predisposition to suffer from gout since they lack the enzyme uricase that breaks down uric acid. The Gout may be due to vitamin A deficiency, diets too rich in protein or renal lesions, toxic or infectious in origin.

Enlarged, pale kidneys with yellow deposits.

Enlarged, pale kidneys with yellow deposits.

Micrograph showing a typical monosodium urate crystal in the renal parenchyma, also known as tophi.

Micrograph showing a typical monosodium urate crystal in the renal parenchyma, also known as tophi.