The Skull Base Institute describes a meningioma as any tumour occurring in the meninges, the membranes that surround the brain and spinal cord. Meningiomas are classified based on where they occur. A right parietal falcine meningioma is a tumour that occurs in the right parietal lobe, along the falx cerebri.
Several membranous layers that cover the brain and spinal cord, including an outermost layer called the dura, make up the meninges. The dura folds into the brain, creating both dural folds and the falx cerebri. Meningiomas are the second-most-common type of brain tumour, making up 20 per cent of tumours. They are usually benign, slow-growing tumours and occur more commonly in individuals between the ages of 40 and 70, affecting women more often than men.
Right Parietal Falcine Meningioma
Tumours that grow along the falx cerebri, the enfolding of the dura that separates the right and left halves of the brain, are called falcine meningiomas. Parietal meningiomas occur in the parietal lobe of the brain, one of the four lobes of the cerebrum. According to Bryn Mawr College, the parietal lobe is responsible for movement, orientation, recognition, and the perception of stimuli. Merck Manuals further notes that damage to the right parietal lobe often causes apraxia, or difficulty with simple tasks like dressing oneself.
Causes of Meningiomas
The Skull Base Institute lists radiation as the only confirmed cause of meningiomas. Meningiomas also run in families, suggesting a genetic link, though researchers are unsure which genes are involved. Meningiomas are also associated with previous head injuries, other brain tumours or aneurysms and, possibly, viral infections.
Symptoms of Meningiomas
According to the Skull Base Institute, the symptoms of a meningioma depend on where it is, as pressure on certain areas of the brain is what causes symptoms. Symptoms may include headache, stroke, seizure, loss of vision and personality changes. A case described in "Neurology India" involved a 60-year-old man who reported left-side numbness, tingling and seizure-like movements. A computed tomography (CT) scan revealed a mass in his right parietal lobe that was determined to be a falcine meningioma.
Diagnosis and Treatment of Meningiomas
Diagnosis of meningiomas is by magnetic resonance imaging (MRI) or CT scan. These scans can also determine the size and location of the tumours. Biopsies can reveal information about the histopathology of the cells involved. Meningiomas that cause minor or no symptoms are often just observed through MRI scans. If symptoms are more severe, surgery is the best treatment. The Skull Base Institute describes some rare meningiomas that are malignant. These may require radiation as part of the treatment plan. Meningiomas have a good overall prognosis, as they are usually benign and removable.
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