Imaging of crystal deposition diseases

Gout has a tendency for involvement of extensor surfaces. [...]quadriceps and patellar tendon involvement is common (Figure 2). On MR imaging, HA deposits are of low signal. [...]there is often overlying inflammation and edema, which the radiologist may misinterpret as tenosynovitis or joint synovitis with infection or injury.24 At high calcium concentrations (above 30% to 40%) susceptibility effects and decreases in proton density dominate, leading to signal intensity loss.25 However, T1 shortening effects resulting in hyperintensity on T1-weighted images are also present.