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A 50-year-old woman presented with a several-year history of acute and chronic joint pain. Her serum magnesium level was 0.9 mg per deciliter (0.4 mmol per liter) (normal range, 1.6 to 2.5 [0.7 to 1.0]), and the total daily urinary excretion of magnesium and the fractional clearance of magnesium were elevated. Radiography revealed chondrocalcinosis in the knee (Panel A, arrow), outlining the articular cartilage and especially the lateral meniscus, and calcifications in the wrist (Panel B) that were deposited on the triangular cartilage (arrow) as well as the radial-carpal and intercarpal cartilage. Chondrocalcinosis is the presence of linear, stippled calcification . . . [Full Text of this Article] |