The brain is located in a closed box and the parts of the brain are separated from each other by solid membrane structures. When there is cerebral edema, that is, when the brain swells, some parts of the brain may herniate. The brain tries to come out of the hole at the bottom of this closed box, which means a brainstem herniation. Or, when a part of the brain swells, it tries to get out from under the thick membranes that limit this part, that is, to herniate, and a midbrain hernia occurs. When the specific symptoms of a brain herniation appear, neurosurgeons sometimes perform decompression surgery to save the patient's life; In other words, they try to remove a part of the skull and make room for the swollen brain.
Sisterna magna is the name of one of the water-filled spaces in our brains. Cerebrospinal fluid, or CSF, circulates in these spaces. The term mega cisterna magna is the name given when one of these spaces is wider than normal. After all, this is not a disease or a risky condition. It's just a personal difference. So it's a simple difference like my nose is bigger and my brother's chin is more pointed. The reason why such statements are included in the examination results is because the experts who write these reports have to report all the differences they see.
The word arachnoid is the name of one of the membranes surrounding the brain, and the cerebrospinal fluid, that is, CSF, circulates between the fibers of this membrane. When the circulation of this fluid is blocked for any reason, a pond in the fluid in that area, medically known as a cyst, occurs. As a matter of fact, the most frequently reported condition in brain imaging studies are these arachnoid cysts. These cysts are not a tumor or malignant structure. Most of the time, it has been there since infancy and will not cause any problems in the future. However, in rare cases, they may need surgery when they grow older, so they are monitored with intermittent examinations. Sometimes, more detailed examinations may be required to distinguish them from certain tumors.
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