Low or low or mixed density lesions with unclear borders

Cystic changes may occur, but necrosis and hemorrhage are rare, and calcification is mostly absent

There is moderate edema and space-occupying symptoms around the lesion

The mass is of equal or slightly high density, round in shape, with clear borders, and spotty calcifications are common within it.

Mostly connected to the dura mater by broad base

Peritumoral edema is mild or absent, and moderate or severe edema may occur when veins or sinuses are compressed.

Involvement of the skull plate causes local bone hyperplasia or destruction

It is iso- or slightly hyperintense on T1 and iso- or hyperintense on T2.

Grade I meningiomas show uniform and obvious enhancement, while atypical and anaplastic meningiomas show patchy heterogeneous enhancement and invade normal brain tissue.

Thickening and enhancement of the adjacent meninges is called the "meningeal tail sign"

Enhanced examination is required: enhance low, equal or slightly high density nodules in the pituitary

Indirect signs: pituitary gland height greater than or equal to 8 mm, protrusion of the superior edge of the pituitary gland, deviation of the pituitary stalk, and subsidence of the sellar floor

Plain scan: The most common enlargement of the sella turcica, the mass is of equal or slightly high density, and there are often low-density lesions in the sella turcica. Bone changes in the sella turcica are also common, including destruction of the sellar floor, dorsum sellae and tuberculum sellae, and can move towards the sphenoid sinus. grow

The intrasellar mass protrudes upward into the suprasellar cistern, invades the cavernous sinus, and compresses the optic chiasm, the anterior part of the third ventricle, and the Monteggia foramen area.

MRI shows better than CT. Ordinary MRI can show small abnormal signal foci in the pituitary. Early enhancement shows clear-demarcated low signal.

Slightly low signal on T1, iso- or high-intensity on T2, and enhanced examination shows obvious uniform or uneven enhancement.

Multiple or single nodules in the brain, and single nodules can be larger; often located in the corticomedullary junction area;

They are iso- or low-density lesions, with necrotic cystic changes in the center, and the density increases during bleeding; the peritumoral edema is severe, with the characteristics of "small lesions, large edema".

The lesions show nodular or ring-shaped enhancement, and those with multiple lesions may enhance in different forms.

T1 low signal, T2 high signal, intratumoral hemorrhage are all high signal

Performance is the same as enhanced CT