The different types of calcinosis observed in rheumatic patients are described : those most frequently found are periatricular and tendinous ; others that are less frequent are subcutaneous and result from tissue attack (filariasis, repeated microtraumatisms) ; diffuse dystrophic calcinoses of the Thibierge and Weissenbach syndrome ; and lasty, in contrast to the preceding examples, diffuse, dystrophic, and metabolic articular chondrocalcinosis. The etiopathogenesis of these calcinoses remains obscure, but the phenomenon of calciphylaxis seems to be involved.