A case of renal myelolipoma and amyloidosis associated with osseous metaplasia in a 14 day old broiler chicken in an experimental group is described. Beginning with their 6^th day of life, forty broiler chickens (Ross 308) were randomly separated into two groups of 20 subjects each. The experimental group was treated with ochratoxin A (OTA) for 21 days (50 µg/kg/day) and the other one constituted the control group. Histological examination of the kidney revealed a proliferation of mature adipocytes, accumulation of numerous myelocytes, erythroblasts, eosinophilic myelocytes and heterophils, delimited by an osseous tissue surrounded by renal parenchyma. A similar ectopic metaplastic tissue was observed in the lungs. Additionally, in kidneys, skin and liver an amorphous deposit of amyloid was observed.

Key words: Chicken, Kidney, Lung, Myelolipoma, Osseous metaplasia