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The renal lesions of electrolyte imbalance. IV. The intranephronic calculosis of experimental magnesium depletion.

A dietary depletion of magnesium in rats leads to the production in the thin limb of Henle's loop of the nephrons of spherical microliths composed of a matrix of PAS-positive substances and calcium phosphate (3). These microliths grow by accretion to form intranephronic calculi. The classical pathological syndrome of clinical nephrolithiasis is thus reproduced within the nephron; to wit, the origin of the calculus at a certain level, local traumatic damage at the site of its origin, passage with the fluid flow down the urinary passages, lodgment of the calculus at some restricting point, obstr