Psittacine birds are more frequently affected. There are two major forms of gout differentiated by the sites of uric acid deposition. These are synovial and visceral gout. In both forms, deposits consist of needle shaped crystals called tophi. Synovial and visceral gout may occur separately or in conjunction.
Synovial gout is considered to be the chronic form of the disease and is the more common.
Lesions observed are urate deposition around joints, ligaments, and tendon sheaths. There is a predilection for peripheral articulations. Deposits may have a creamy, pasty or gritty consistency. They may be extremely painful and disfigure the leg. The hock, joints of the feet, and tendon sheaths of the forewing are usually affected.