Sudden death in turkeys with perirenal hemorrhage: pathological observations and possible pathogenesis of the disease.

A pathological study was conducted on 32 turkeys that died of sudden death with perirenal hemorrhage syndrome. Turkeys were selected from routine necropsy cases in a diagnostic laboratory. A higher incidence was observed in heavy tom turkeys. In addition to the characteristic gross lesions of perirenal hemorrhage, splenomegaly, and pulmonary congestion, turkeys in most cases had a hypertrophic cardiopathy. Microscopic lesions included moderate-to-marked acute passive congestion of all tissues examined (32/32), severe perirenal hemorrhage (32/32), and splenic lymphoid depletion (25/32). Changes in the thyroid follicular epithelium of most birds suggested an increased glandular activity. No lesions suggestive of arterial hypertension were observed. Adenoviral infection was detected in only four of 32 birds. Bacteriological cultures revealed no significant pathogen. Results suggest that sudden death in turkeys with perirenal hemorrhage is caused by an acute congestive heart failure consecutive to a hypertrophic cardiopathy. The perirenal hemorrhage would be a consequence of a severe passive congestion in kidneys.