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Case Reports
Journal Article
Hypophosphatemic rickets accompanying congenital microvillous atrophy.
Journal of Bone and Mineral Research 1998 December
This report concerns an 11-year-old boy who manifested hypophosphatemic rickets associated with congenital microvillous atrophy (CMA). He had been suffering from vomiting and severe diarrhea from the first day of life and had been treated with total parenteral nutrition (TPN) since he was 67 days old. At 4 years of age, intestinal biopsy resulted in a diagnosis of CMA. He was admitted to our hospital complaining of leg pain at the age of 11. Laboratory data revealed hypophosphatemia, elevated serum 1, 25-dihydroxyvitamin D (1,25(OH)2D) levels, and hypercalciuria. A roentgenogram showed rickets in the extremities. A balance study of phosphate in urine and stool indicated that the amount of phosphate leaking into the stool was greater than that into the urine. Moreover, the total amount of phosphate leaking from both the intestine and kidney exceeded the amount of phosphate intake from TPN. The rickets was healed by increasing the phosphate concentration in TPN. This case is different from X-linked hypophosphatemic rickets but similar to hereditary hypophosphatemic rickets with hypercalciuria (HHRH) in terms of hypercalciuria and elevated serum 1,25(OH)2D levels. The effectiveness of phosphate treatments used here is also similar to that used for HHRH. However, this type of hypophosphatemic rickets is unique in that phosphate leaking into the intestine plays an important role in its pathogenesis.
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