The main objective is to evaluate the decrease in crystalline volume of the target tophus using Dual-Energy Computed Tomography (DECT), after 6 months +/- 1 month of urate-lowering therapy with target uricemia. Study hypothesis * The dynamics of tophus resolution with urate-lowering therapy is poorly understood. * It is variable according to the location of the tophus, peri articular / intratendinous, but also probably at the feet / hands, the initial overall volume of the tophus, the initial crystal charge of the tophus. Knowledge of prognostic factors for tophus resolution will help determine the best target for treatment follow-up for each patient. * Erosions are the consequence of tophus. Tophus resolution could be associated with repair of erosions and stabilization of joint destruction.
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the percentage of decrease in crystal volume of the target tophus
Timeframe: after 6 months +/- 1 month of traitment