Pituitary adenomas are the third most common intracranial neoplasms (behind meningiomas and astrocytomas), accounting for about 10% of all intracranial tumours in adults.[1] There is no known sex or racial difference in prevalence. The prevalence of pituitary adenoma varies from 19 to 28 cases per 100,000, in the UK, to 94 cases per 100,000 in Belgium, and increases with age.[15][16][17] There is a peak in incidence between the ages of 30 to 60 years; the presentation may be earlier in women (typically at 20 to 45 years) than in men (35 to 60 years), owing to the greater frequency of prolactinomas in young women.[15][18]

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