Pituitary adenomas are tumors that occur in the pituitary gland, often also known as pituitary adenomas, and are one of the common neuroendocrine tumors, accounting for approximately 10%-15% of neurological tumors. The majority of pituitary adenomas are benign. The MRI presentation of pituitary adenoma is as follows. First, the tumor often has low or equal signal on T1-weighted images, and high or higher signal on T2-weighted images. Second, if MRI enhancement is performed, the tumor will be significantly enhanced. Third, the tumor can be seen to invade into the saddle compartment and the saddle side. Microadenoma is low signal on T1-weighted image, equal signal on proton density-weighted image, high signal on T2-weighted image, and indirect signs such as upward asymmetry and bulge of saddle frame, pituitary stalk deviation and saddle base tilt.