Tumoral Calcinosis: Evidence for Concurrent Defects in Renal Tubular Phosphorus Transport and in 1 Alpha,25-dihydroxycholecalciferol Synthesis

Overview

Journal Calcif Tissue Int

Specialty Pathology

Date 1980 Jan 1

PMID 6775776

Citations 9

Authors

J E Zerwekh

L A Sanders

J Townsend

C Y Pak

Affiliations

Soon will be listed here.

Abstract

A 50-year-old Latin American man with tumoral calcinosis presented with hyperphosphatemia (6.62 +/- 1.04 SD mg/dl), elevated renal threshold phosphorus concentration (TmP) (7.3 mg/GFR), and 1,25-dihydroxyvitamin D [1,25-(OH)2D] (69 pg/ml) hypercalciuria (239 mg/day), and a high fractional intestinal calcium (Ca) absorption (0.74). Sodium cellulose phosphate therapy (20 g/day) lowered urinary Ca, and partially reduced serum phosphorus (P) and TmP to 5.91 +/- 0.63 mg/dl and 6.2 mg/GFR, respectively. Serum 1,25-(OH)2D remained elevated at 58-64 pg/ml. Amphojel therapy (4 oz/day) decreased urinary P to 23 +/- 21 mg/day and lowered serum P to 5.75 +/- 0.36 mg/dl (P < 0.05). TmP increased to a value of 8.0 mg/GFR while serum 1,25-(OH)2D continued to remain elevated at 53 pg/ml. This case illustrates the probable operation of dual abnormalities in tumoral calcinosis represented by augmented renal conservation of P and an elevation in the circulating concentration of 1,25-(OH)2D.

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