Isotropic hemianopia

Introduction The damage of the passage after the eye beam or the lateral geniculate body can produce a visual field defect on one side of the nasal side and the other side, which is called the same direction hemianopia. Early symptoms of temporal lobe tumors, visual field changes, when the tumor is located in the deep temporal lobe, due to affecting or destroying the optic tract or visual radiation, the visual field defect of 1/4 of the contralateral upper quadrant can occur at the beginning of the disease. When the tumor continues to increase, the quadrant defect can develop into isotropic hemianopia.

Cause

The cause of this disease is unknown, some scholars believe that it may be related to trauma, genetics, diet, stress and other factors. Localized seizures gradually develop into systemic major seizures, with visual field changes during the intermittent episodes. The above-mentioned 1/4 quadrant visual field defects develop into isotropic hemianopia, Todd paralysis becomes longer, aphasia and mental symptoms worsen, and finally leads to cranial The internal pressure is increased. May be related to your own lifestyle.

an examination

Related inspection

Ultrasound examination of the eyeball and eyelid and CT examination of the temporal region

There are no obvious clinical symptoms in the early stage of temporal lobe tumors. Temporal lobe seizures often occur as the disease progresses. According to the frequency of seizures, hallucinations occur. Localized seizures gradually develop into systemic major seizures, with visual field changes during the intermittent episodes. The above-mentioned 1/4 quadrant visual field defects develop into isotropic hemianopia, Todd paralysis becomes longer, aphasia and mental symptoms worsen, and finally leads to cranial The internal pressure is increased. Psychomotor episodes gradually progress to multi-line tumors to the subcortical lysate. The main clinical symptoms are as follows:

1, visual field changes: visual field changes are often one of the early symptoms of temporal lobe tumors, with a sense of positioning. Anatomically, the radiation surrounds the lateral ventricle of the lateral ventricle through the temporal lobe. When the tumor is located in the deep part of the temporal lobe, due to the influence or destruction of the optic tract or visual radiation, a visual field defect of 1/4 of the contralateral isotropic upper quadrant may occur at the beginning of the disease.

2, sensory aphasia: located in the dominant hemisphere tumor damage 41 upper back to the 41, 42 area, there may be a sensory aphasia. When the back of the temporal lobe is damaged, a nominal aphasia can occur. This is one of the most reliable symptoms for the diagnosis of temporal lobe tumors.

3, seizures: the incidence of epileptic seizures caused by temporal lobe tumors is second only to frontal lobe tumors. Some patients may also have localized seizures, mostly due to tumor invasion of the motor area.

4, mental symptoms: temporal lobe tumor mental disorders are also common symptoms, second only to frontal lobe tumors. The main symptoms are personality changes, emotional abnormalities (such as anxiety, depression, panic, anger), eccentricity, memory impairment, mental retardation, and apathy. Psychiatric symptoms occur more frequently in tumors with extensive and rapid growth of dominant hemispheres.

5, ataxia: the middle part of the middle and the lower back of the sputum, through the sacral leaf cerebellum fibers and the cerebellum, therefore, one side of the temporal lobe damage can also occur contralateral half-body ataxia, it can also A balance disorder occurs, often dumping the lesion to the opposite side.

6, pyramidal tract sign: the upper part of the temporal lobe, you can oppress the lower part of the frontal and parietal lobe and the movement of the face and upper limbs or sensory disturbance, oppression of the contralateral cerebral pedicle, internal capsule, can cause the tumor on the same side of the cone Bunching, and producing different degrees of hemiplegia.

7, other symptoms: the medial temporal lobe tumor, you can oppress the midbrain and oculomotor nerve palsy. Horner's syndrome may occur when temporal lobe tumors compress the carotid sympathetic plexus of the cranial. When the basal ganglia is involved, contralateral limb tremor, chorea, hand and foot dyskinesia, and paralytic tremor syndrome appear. There may be spontaneous visceral pain when invading the island leaves.

Differential diagnosis

1 sacral hemianopia: If the bilateral nerve conduction to the nasal retinal vision caused by tumor compression is involved, bilateral stimuli may not be accepted and bilateral sacral hemianopia may occur. When the tumor grows up, the side loses its visual function due to the weight on one side, and the other side is blind, and the other side is unilaterally blind.

2 omnidirectional hemianopia: damage to the pathway after the optic tract or the lateral geniculate body can produce a visual field defect on one side of the nasal side and the other side of the iliac crest, which is called co-directional hemianopia. The visual beam is different from the central hemianopia. The former is accompanied by the disappearance of light reflection, and the latter has light reflection. The former is blunt and complete, while the latter is more incomplete and quadrant hemian; the former patient's subjective sensory symptoms are more significant than the latter. No self-conscious symptoms; the latter's visual field center of vision is preserved, showing macular avoidance.

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