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Calculi in any part of the urinary tract. According to their composition or pattern of chemical composition distribution, urinary calculi types may include alternating or combination, cystine, decubitus, encysted, fibrin, hemp seed, matrix, mulberry, oxalate, struvite, urostealith, and xanthic calculi.

Formation of urinary calculi.

The formation of urinary calculi, also the condition of the system that results from such formation. [Gr.]