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Acromegaly and bone disease

Purpose of reviewTo provide an update on current understanding of osteoporosis associated with acromegaly. Recent findingsPatients with acromegaly have an increased risk of morphometric vertebral fractures. This seems to correlate with acromegaly activity and its duration, but it persists after biochemical control is achieved. Coexistent hypogonadism, diabetes mellitus and over-replacement with glucocorticoids have additional detrimental effects. Bone mineral density can be normal, increased or decreased, and is usually discordant with occurrence of fractures. However, a decrease in the hip bone mineral density during follow-up has been associated with development of new vertebral fractures. Bone turnover markers are increased and tend to normalize after biochemical control of acromegaly. Hypercalcemia rarely occurs in acromegaly and may be parathyroid hormone-dependent or 1,25 dihydroxy-vitamin D dependent. The latter improves with biochemical control of acromegaly. SummaryScreening with thoracic and lumbar vertebral radiographs is indicated in patients with acromegaly. We recommend biochemical control of acromegaly, treatment of hypogonadism and other risk factors of osteoporosis and avoiding supraphysiologic doses of glucocorticoids. Further studies are needed to understand mechanisms of skeletal fragility in acromegaly and clinical impact of vertebral fractures. Further studies of tailored therapy for patients with acromegaly and osteoporosis are also needed.