Atrophy of one side of the papilla and edema of the other side are usually seen in tumors or abscesses at the base of the frontal lobe of the brain, such as internal carotid artery aneurysms, olfactory groove meningiomas, meningiomas at the base of the skull in the anterior cranial recess, and craniopharyngioma. Other tumors such as internal carotid artery spindle dilation, internal carotid artery sclerosis, trauma to the anterior cranial sulcus, arachnoiditis of the anterior cranial sulcus may also cause atrophy of the optic papilla on one side and edema on the other side. As one side of the optic nerve is directly compressed by the tumor and atrophied first, later on the tumor continues to grow and increases the intracranial pressure, resulting in edema of the healthy side of the optic papilla. How to check the atrophy of one side of the papilla and edema of the other side? Through fundus examination, if one eye has pale or pale optic papillae with atrophy, and the other eye has elevated optic papillae with blurred edges and edema, it means that one side has atrophy and the other side has edema. Cranial plain examination can be used for localization or qualitative diagnosis of certain frontal lobe tumors, such as oligodendroglioma, which can sometimes appear as calcified spots, characterized by interlocking calcium spots in the form of cords, spots or clusters; astrocytoma, calcification mostly occurs in the cystic wall or body of the tumor, with calcified shadows in the form of arcs, cords, slices or spots; ventricular meningioma, which tends to occur in the lateral ventricles, commonly has speckled calcified shadows. Calcifications of meningiomas tend to appear as large masses with high density and clear contours, with sand-grain meningioma calcifications being the most common. When frontal lobe glioma, meningioma and metastases are close to the skull, they can cause cranial resorption, thinning, destruction and defect. When frontal lobe tumors cause increased cranial pressure, it can be seen that there is an increase in cerebral gyrus pressure, cranial suture splitting, and alteration and displacement of the bones in the pterygoid saddle. The tumor at the base of frontal lobe in cranial plain radiograph can be seen as displacement of lateral ventricles to the healthy side, but the displacement is not significant; the ventricular division of the diseased side is unclear, and the base of anterior horn is pressed up. The anterior horn may be displaced posteriorly or superiorly; narrowing and flattening of the base appear as curved indentation or mass; the anterior part of the lateral ventricle is flattened or curved indentation. The third ventricle fills well and is seen to flatten and shift posteriorly and inferiorly in its lower part. The midbrain aqueduct and the fourth ventricle were not abnormal.