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Hyperparathyroidism is the effect of excess parathyroid hormone in the body. It can be primary, secondary or tertiary. There are many characteristic imaging features predominantly involving the skeletal system.


Increased levels of parathyroid hormone (PTH) lead to increased osteoclastic activity. The resultant bone resorption produces cortical thinning (subperiosteal resorption) and osteopaenia.


Both syndromes are associated with multiple adenomas or parathyroid hyperplasia.

Radiographic features

Findings in secondary (and tertiary) hyperparathyroidism are often associated with the osteosclerosis of renal osteodystrophy, and the osteomalacia of vitamin D deficiency:

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