What Is the Left Occipital Lobe?

1. Craniocerebral trauma: easily cause occipital contusion, cortical blindness can occur after injury, and quadrant blindness can be seen in limited injuries.

Occipital lobe syndrome

Occipital lobe is the center of visual cortex. When the occipital lobe is damaged, not only visual impairments, but also memory deficits and motor perception disorders appear, but visual symptoms are the main symptoms.

Occipital lobe symptom pathology

1. Craniocerebral trauma: easily cause occipital contusion, cortical blindness can occur after injury, and quadrant blindness can be seen in limited injuries.

2. Cerebrovascular disease: the parietal occipital branch of the dominant middle cerebral artery occludes, and Gerstmann's syndrome appears on the opposite side of the lesion.

3. Tumor: Glioblastoma of the occipital lobe develops from the cortex behind the occipital and posterior temporal to the subcortical white matter, and becomes blind when invading the hind limb of the inner capsule.

Occipital lobe symptoms

1. Visual hallucinations: When the occipital lobe is damaged or the visual center is damaged, hallucinations can occur, such as flashes, portraits, etc., and can occur simultaneously with the deformation of the visual object.

2. Visual field defect: small focal lesions on one side of the occipital lobe, causing an isotropic blindness of the central dark spot. Cerebrovascular disease of one occipital lobe causes isotropic blindness.

3. Impaired visual recognition: Patients cannot use visual recognition for text; cannot recognize common items; cannot recognize space and face; the azimuth relationship and distance between objects cannot be clear.

4. Eye movement disorders: Balint visual palsy can occur in the occipital lobe. When the patient looks to the right, there is no rapid shift of the sight to the left.

5. Memory impairment: visual appearance is missing, patients can make normal reasoning and retell distant experiences, but recent memory cannot, even fiction.

6. Motion perception disturbance: When the patient sees the moving object, he only sees the arrangement of the objects in sequence, he has incomplete experience of the speed of the object, the estimated time of the movement is insufficient, and he cannot see the movement of the object.

Differential diagnosis of occipital symptom group

1. Occipital lobe tumor Occipital lobe tumors often involve the parietal lobe and posterior temporal lobe. In the early stage, only the lesions have visual field defects, amblyopia, or loss of color vision. It is mainly contralateral hemianopia or quadrant blindness, and simple and immature visual hallucinations and deformation of visual objects in the contralateral visual field. The disease often occurs with visual seizures. The location of hallucinations is relatively constant. Most of them occur within the visual field of the contralateral side of the lesion. The frequency of seizures gradually increases. As the number of seizures increases, localized symptoms such as blindness, aphasia, and aphasia appear successively. Visual episodes have nothing to do with the environment.

2. Internal carotid artery occlusion (arteria carotis interma oblileration) Contralateral visual field blindness, paralysis of the upper and lower limbs, and sensory disturbances of the leaning, that is, triple bias. Sometimes hemianopia is manifested as quadrant blindness, especially lower quarter blindness. Occurrence of ocular-pyramidal paralysis, transient darkening on the side of the lesion, optic nerve atrophy on the fundus and hemiplegia-based disease on the contralateral side, often accompanied by dilated or dilated pupils.

3. Occlusion of posterior cerebral artery Occlusion of posterior cerebral artery may have hemianopia. This hemianopia may be complete or incomplete, and the latter is mostly in the upper quadrant. May be associated with named aphasia and dyslexia. Posterior cerebral artery occlusion on both sides is manifested by bilateral isotropic blindness and macular avoidance. There is often a transient blackness and fog in the eyes. Pale nipples can be seen on the blind side after a long time.

4. Schilder's disease (Schilder's disease) often develops in children. Eye symptoms include decreased vision, isotropic blindness, or cortical blindness. There is generally no change in the fundus. When the lesion affects the optic tract and the optic cross, pale eyes may appear, and the response to light may be slow. In addition, the disease often has symptoms of mental retardation, motor system and sensory system damage.

5. Multiple sclerosis. More than half of the patients with this disease develop posterior optic neuritis. Acute eye education is accompanied by sharp vision loss. Blindness can occur from one to two days, which can be one side first and later the other side. The pupil is dilated, the light reflection diminishes, the central dark spot can reach 10 ° 20 °, and the peripheral visual field is often unchanged. The above symptoms generally recover quickly, but often recur.