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HYPERPARATHYROIDISM |
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primary hyperparathyroidism: [high serum calcium] |
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parathyroid adenoma (commonest cause)parathyroid hyperplasia multiple adenomas functioning parathyroid carcinoma (very rare)paraneoplastic syndrome [ectopic PTH production, usually by bronchial (sq.) or renal ca] |
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secondary hyperparathyroidism: [low serum calcium] |
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chronic renal failure (renal osteodystrophy)distal renal tubular acidosis vitamin D deficiency, eg. rickets and osteomalacia, malabsorption |
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tertiary hyperparathyroidism: [high serum calcium] |
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following secondary hyperparathyroidism after removal of its cause |
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