middle cranial fossa meningioma
Introduction
Introduction to meningioma of the middle cranial fossa The middle cranial fossa meningioma is a meningioma that occurs in the bottom of the middle cranial fossa of the sphenoidal wing. It is usually located in the dura mater and the blood supply is abnormal. basic knowledge The proportion of illness: 0.0025% Susceptible people: no special people Mode of infection: non-infectious Complications: cerebral edema
Cause
The cause of meningioma in the middle cranial fossa
Pathogenesis
The tumor is endothelial type, fibrous type is more, followed by vascular type, a few are meningeal sarcoma, the tumor is spherical or flat, and develops along the middle of the cranial fossa. The inward can compress the inner and the cavernous sinus, forward to the sphenoid bone., outward can cause zygomatic hyperplasia, can erode the tip of the rock back, and can enter the posterior cranial fossa through the cerebellum, usually located in the dura mater, rich in blood supply, mainly by the middle meningeal artery and middle cerebral artery.
Prevention
Prevention of meningioma in the middle cranial fossa
Prevention of brain tumors is necessary. People who have regular routines and irregular living habits, such as singing karaoke, playing mahjong, and not returning to the night, will have aggravated physical acidification and are prone to cancer. The most promising means of brain tumors, studies have confirmed that high-risk groups under the guidance of doctors, taking the Chinese medicine ginsenoside Rh2 for 5 years, can reduce the incidence of nearly half of brain tumors, the use of ginseng after surgery, radiotherapy and chemotherapy The saponin Rh2 (the optimal absorption of the human body is 16.2%) capsule can also play a role in preventing recurrence and metastasis.
Complication
Complications of meningioma in the middle fossa Complications brain edema
1. Intracranial hemorrhage or hematoma is not related to intraoperative hemostasis. With the improvement of surgical techniques, this complication has been less frequent. The wound is carefully hemostasis and repeated flushing before closing the skull can reduce or avoid postoperative intracranial hemorrhage.
2. Cerebral edema and postoperative high intracranial pressure can reduce intracranial pressure with dehydrating drugs, and glucocorticoids can alleviate brain edema.
3. The loss of nerve function is related to the important functional area and important structure of intraoperative injury. The injury should be avoided as much as possible during the operation.
Symptom
Symptoms of meningioma in the middle cranial fossa Common symptoms Hearing loss Visual field of vision Diplopia Eyelid hypoglossal oculomotor nerve paralysis Neuralgia Cerebral palsy
There are many cranial nerves in the cranial fossa, so the early stage clinical manifestations of the brain in the cranial fossa are the symptoms and signs of the cranial nerves. They have localized significance. They should pay attention to the clinical history, and 2, 3 of the trigeminal nerves. Through the round hole and round hole, the typical cranial fossa meningioma often has trigeminal neuralgia in the early stage, which can be as high as 38.0%. One side of the oculomotor nerve paralysis is also one of the early manifestations of this disease. The pre-development affects the cavernous sinus or supracondylar sinus, the patient may have eye movement disorder, eyelid drooping, diplopia; when the tumor affects the optic nerve, the patient may have visual field vision changes, some tumors develop backward, and VII, VIII brain nerves are involved. For hearing loss and peripheral facial paralysis.
Some patients have temporal lobe epilepsy, mainly the invasion of the hippocampus of the temporal lobe, the amygdala, the tumor is larger or the cerebellar incision and chronic cerebral palsy affect the cerebrospinal fluid circulation, and the patient has increased intracranial pressure.
Examine
Examination of meningioma in the middle cranial fossa
1. Skull flat film: The skull base image has certain value for the diagnosis of this disease. It can be seen that the bone in the middle cranial fossa is destroyed, which shows that the density is reduced, the round hole and the spinous hole are enlarged and unclear, and the bone bone is destroyed. Tumor calcification is scattered in patchy or densely packed strips.
2. CT and MRI: The mid-cranial fossa meningioma showed a high-density image with clear boundary in CT. The contrast was significantly enhanced after injection. A small number of patients showed mixed density areas. If the tumor has calcification, CT is extremely high. Density, MRI can be seen with long T1 short T2 signal, and the tumor boundary is clear.
3. Cerebral angiography: manifested as ankle occupying sign, such as the internal carotid artery is compressed by the tumor, the intracranial blood vessels are often poorly filled, and the thickening of the meninges caused by the cavernous sinus of the internal carotid artery develops the characteristics of the disease, but Rarely, therefore, the use of general angiography technology, tumor staining is not obvious in most cases, digital subtraction angiography helps to understand the blood vessels in the tumor, 80% of the group can be seen tumor staining.
Diagnosis
Diagnosis and diagnosis of meningioma in the middle cranial fossa
According to CT, MRI findings and clinical symptoms can basically confirm the diagnosis of meningiomas in the middle cranial fossa, and the skull base X-ray film is also helpful for the diagnosis of this disease.
There are no special diseases to identify.
