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Tenosynovial giant cell tumor (TGCT) is a non-malignant tumor defined histologically as inclusions of “osteoclast-like” multinucleated giant cells, hemosiderin, and macrophages. [1] This histology can present one of 2 clinically distinct ways. TGCT tumors often develop from the lining of joints (also known as synovial tissue).
Villonodular synovitis is a type of synovial swelling.. Types include: Pigmented villonodular synovitis; Giant cell tumor of the tendon sheath; Though they have very different names, they have the same histology, and stain positive for CD68, HAM56, and vimentin. [1]
Giant-cell tumor of the tendon sheath, also known as giant-cell synovioma, localized nodular tenosynovitis and localized tenosynovial giant cell tumor or TGCT [1] is a firm lesion, measuring 1 to 3 cm in diameter, and is most commonly attached to the tendons of the fingers, hands, and wrists, with a predilection for the flexor surfaces.
The decision comes months after independent experts on an advisory panel to the FDA voted in favor of Turalio as a treatment for the debilitating condition called tenosynovial giant cell tumor (TGCT).
This description is based on the observations that the cysts occur close to tendons and joints. The microscopic anatomy of the cyst resembles that of tenosynovial tissue. The fluid is similar in composition to synovial fluid. Dye injected into the joint frequently ends up in the cyst.
Pexidartinib, sold under the brand name Turalio, is a kinase inhibitor drug for the treatment of adults with symptomatic tenosynovial giant cell tumor (TGCT) associated with severe morbidity or functional limitations and not amenable to improvement with surgery.
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