Prevalence of hypothalamic-pituitary tumours - retrospective analysis of 20-year own material.

Objectives: The prevalence of pituitary tumours has recently been identified to be higher than previously thought. The aim of our study was to assess the occurrence of hypothalamic-pituitary tumours in 20-year material of the Department of Endocrinology and Metabolic Diseases, Polish Mother`s Memorial Hospital - Research Institute, Lodz, Poland.
Methods: We analyzed medical data of 845 patients, hospitalized from 1990 to 2009 due to presumptive diagnosis of hypothalamic-pituitary tumour. Among 340 cases with confirmed diagnosis, 278 tumours were classified as micro- or macroadenomas. Tumour type and size, as well as patient gender and age, were evaluated. In 252 tumours the exact volume was calculated, and 4 volume subgroups were assessed for each aforementioned parameter separately.
Results: Prolactinomas and - at the next place - non-functioning adenomas were the most frequent, followed by pituitary tumors of non-epithelial origin, and - finally, the rarest - other secreting adenomas. Prolactinomas were found mostly in females (p=0.028), while non-functioning adenomas in males (p=0.045). Prolactinomas and non-functioning adenomas were found to be predominantly microadenomas (p<0.0001 and p=0.0003, respectively), while mixed-type adenomas were mostly macroadenomas (p=0.028). In females microadenomas were the most frequent (p<0.0001). Moreover, in persons under 50 years of age microadenomas predominated, whereas in older adults macroadenomas mostly occurred.
Conclusion: To conclude, our retrospective, single-centre study provides relevant estimates of prevalence of hypothalamic-pituitary tumours in the era of modern diagnostic tools and indicates that our data are comparable with results regarding other populations worldwide.