One of the mineral concretions about the joints, and in other situations, occurring chiefly in gouty persons. They consist usually of urate of sodium; when occurring in the internal organs they are also composed of phosphate of calcium.

Subcutaneous nodule composed of urate. Seen in chronic gout.

a deposit of urates around a joint or in the external ear; diagnostic of advanced or chronic gout

Calcareous tufa.

an incrustation that forms on the teeth and gums