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Tophus

A tophus is a deposit of monosodium urate crystals in people with longstanding high levels of uric acid (urate) in the blood, a condition known as hyperuricemia. Tophi are pathognomonic for the disease gout. Most people with tophi have had previous attacks of acute arthritis, eventually leading to the formation of tophi. Chronic tophaceous gout is known as Harrison syndrome.

Pathophysiology
It appears that monosodium urate crystals trigger a distinct physiological NETosis pathway that coats them in DNA. These coated crystals then persist in tissues as a foreign body granuloma constituting gouty tophus. ==Gallery==
Gallery
File:Gross pathology of tophus.jpg|Gross pathology of a large tophus Image:Gouty_tophus_-_intermed_mag.jpg|Micrograph of a gouty tophus Image:Tophus in knee.jpg|A tophus being removed from inside a knee joint by arthroscopic surgery image:2015.7.30 Uric Acid synovial Tophus 7.tif|Tophus of uric acid crystals from toe joint fluid (100x polarized light) ==See also==
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