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*'''Renal hyperparathyroidism'''
*'''Renal hyperparathyroidism'''
**Pathogenesis:
**Pathogenesis:
***[[Kidney Renal Failure - Pathology#Chronic|Chronic renal failure]]
***[[Chronic Renal Failure|Chronic renal failure]]
****-> Retention of phosphate (due to reduced glomerular filtration) and inadequate production of vitamin D by kidneys
****-> Retention of phosphate (due to reduced glomerular filtration) and inadequate production of vitamin D by kidneys
*****-> [[Kidney Renal Failure - Pathology#Uraemia|Hyperphosphataemia]] and hypocalcaemia (high P depresses Ca)
*****-> Hyperphosphataemia and hypocalcaemia (high P depresses Ca)
******-> Increased PTH output
******-> Increased PTH output
*******-> Increased bone resorption
*******-> Increased bone resorption