Pituitary adenoma
（重定向自Pituitary neoplasms）
![](/Images/godic/202502/03/Adenome_hypophyse4444.JPG")
![Visual field loss in bitemporal hemianopsia: peripheral vision loss affecting both eyes, resulting from a tumor-typically a pituitary adenoma- putting pressure on the optic chiasm.](/Images/godic/202502/03/Bitempvf_labelled4444.png")
![Morphological facial changes caused by acromegaly; frontal bossing, enlarged nose, prognathism and maxillary widening with separation of teeth and unseen, enlargement of the tongue (macroglossia).](/Images/godic/202502/03/Acromegaly_facial_features4444.JPEG")
![Pituitary gland](/Images/godic/202502/03/Gray11804445.png")
Pituitary adenomas are tumors that occur in the pituitary gland. Pituitary adenomas are generally divided into three categories dependent upon their biological functioning: benign adenoma, invasive adenoma, and carcinomas, with carcinomas accounting for 0.1% to 0.2%, approximately 35% being invasive adenomas and most being benign adenomas. Pituitary adenomas represent from 10% to 25% of all intracranial neoplasms and the estimated prevalence rate in the general population is approximately 17%.