The hypercalcemia and associated hypercalciuria seems to be due to an intestinal hyperabsorption of calcium. It remains to be elucidated, whether an increased calcitriol synthesis within granulomas is the only (main) mechanism by which intestinal calcium absorption is increased. Glucocorticoids seem most appropriate as the first choice for treatment. Bodybuilders should be warned against use of intramuscular oil injections (and other substances), as this may have severe adverse health consequences.
The risk of osteoporosis in patients with MC is not increased. However, DXA scan is recommended in MC patients with known risk factors or active disease requiring longstanding budesonide treatment. Supplementation of calcium and vitamin-D in patients treated with budesonide is recommended.
The Y791F RET proto-oncogene mutation may have a low penetrance. In selected cases, prophylactic thyroidectomy may be replaced by watchful waiting with repeated pentagastrin testing, provided careful evaluation of risks and benefits is performed.
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