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Mycobacterial hygroma in a lion.
(A) Infection with Mycobacterium bovis can lead to hygromas, distended, sac-like structures, over the elbow and hock joints. (B) The opened joint capsule is markedly thickened and there is a chronic, hemorrhagic synovitis within the elbow joint.
(Courtesy of the Roy Bengis, South African Department of Agriculture, Forestry and Fisheries)
