Özçelik, SerhatGökkaya, NaileTiryaki, MehmetAydoğmuş, EvrenÇelik, MehmetYavuzer, DilekAydin, Kadriye2024-06-122024-06-1220212636-7688https://doi.org/10.5455/annalsmedres.2020.07.697https://search.trdizin.gov.tr/yayin/detay/464073https://hdl.handle.net/20.500.14551/13545Aim: Detailed evaluation of patients in preoperative stage is an important factor that reduces morbidity and mortality as well as theoperation itself. In our study, we aimed to examine clinically, pathologically and endocrinologically, the patients who were decided toundergo transsphenoidal surgery, in light of the literature. Materials and Methods: In this retrospective observational study, preoperative and pathological data of consecutive pituitaryadenoma patients who applied to our department from January 2019 to June 2020 and underwent transsphenoidal surgery withmicroscopic methods, were examined. Results: The study included a total of 31 patients. Distribution of patients in relation to pathological diagnoses was as follows:Functional pituitary adenoma (n: 15), non-functional adenoma (n: 11), apoplexy (n: 2), carcinoma metastasis (n: 2) andcraniopharyngioma (n: 1). No statistically significant difference was found between functional and non-functional adenomas, interms of tumor size, cavernous sinus invasion, Ki-67 index and p53 staining pattern (p> 0.05) whereas presence of suprasellarextension and visual field defect were significantly more in non-functional adenomas (p = 0.015, p = 0.045, respectively). Conclusion: Highly invasive character was detected in both functional and non-functional pituitary Ki-67 indexes were low in thestudy population, increased p53 expression was noticeable. We can state that the Ki-67 index may not be directly proportional tothe invasive behavior of the disease.en10.5455/annalsmedres.2020.07.697info:eu-repo/semantics/openAccessArticle283558563464073