text: Pituitary adenomas are tumors that occur in the pituitary gland. Most pituitary tumors are benign, approximately 35% are invasive and just 0.1% to 0.2% are carcinomas. Pituitary adenomas represent from 10% to 25% of all intracranial neoplasms and the estimated prevalence rate in the general population is approximately 17%.
  Non-invasive and non-secreting pituitary adenomas are considered to be benign in the literal as well as the clinical sense, though a 2011 meta-analysis of available research showed that there were, then, scant studies – all of poor quality – to either support or refute this assumption.