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- W2012109813 abstract "A 28-yr-old woman presented with hypocalcemia, hypophosphatemia, secondary hyperparthyroidism, and biopsy-proven osteomalacia despite treatment with vitamin D2, (17.5 mg/day). Three weeks after vitamin D2 treatment was stopped, she was found to have a low normal serum 25-hydroxyvitamin D (25OHD) and high serum 1 alpha, 25-dihydroxyvitamin D [1,25(OH)2D] of 18.6 ng/ml and 21.2 ng/dl, respectively. The fractional intestinal calcium absorption was low at 0.26. Treatment with 25OHD3 (20--50 micrograms/day) corrected the hypocalcemia and secondary hyperparathyroidism, raised intestinal calcium absorption, and reversed the skeletal lesions of osteomalacia. Serum 25OHD concentration rose to 51 ng/ml, while 1,25(OH)2D remained elevated. This case illustrates the probable operation of dual abnormalities in vitamin D metabolism. An impaired end organ responsiveness to 1,25(OH)2D was suggested by a low intestinal calcium absorption in the face of high serum 1,25(OH)2D. Moreover, there may have been a defective vitamin D-25-hydroxylase, since there was a relative refractoriness to treatment with large doses of vitamin D2, an inappropriately low serum 250HD after vitamin D2 therapy, and a responsiveness to treatment with 25OHD3." @default.
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- W2012109813 title "An Unique Form of Osteomalacia Associated with End Organ Refractoriness to 1,25-Dihydroxyvitamin D and Apparent Defective Synthesis of 25-Hydroxyvitamin D*" @default.
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- W2012109813 doi "https://doi.org/10.1210/jcem-49-2-171" @default.
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