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External hydrocephalus is a condition generally seen in infants which involves enlarged fluid spaces or subarachnoid spaces around the outside of the brain. This condition is generally benign , and resolves spontaneously by two years of age [ 43 ] and therefore usually does not require insertion of a shunt.
A suggested alternative or additional function of the granulation may be the dispersal of the overpressure wave formed within the subarachnoid space by the pulsation of arteries during systole. As the venous sinuses are enclosed in rigid dural structures, they represent a non-distensible compartment into which subarachnoid pressure increases ...
Perivascular spaces may be enlarged to a diameter of five millimeters in healthy humans and do not imply disease. When enlarged, they can disrupt the function of the brain regions into which they project. [5] Dilation can occur on one or both sides of the brain. [7] Dilated perivascular spaces are categorized into three types: [7]
The enlarged skull of a person with hydrocephalus, which is a symptom of the excess CSF in the ventricular system. This may be caused by aqueductal stenosis, and in some cases, it is thought that hydrocephalus will cause aqueductal stenosis. Many of the signs and symptoms of aqueductal stenosis are similar to those of hydrocephalus.
The cisterna magna (posterior cerebellomedullary cistern, [1] or cerebellomedullary cistern [2] [3]) is the largest of the subarachnoid cisterns.It occupies the space created by the angle between the caudal/inferior surface of the cerebellum, and the dorsal/posterior surface of the medulla oblongata (it is created by the arachnoidea that bridges this angle [3]).
The subarachnoid cisterns are spaces formed by openings in the subarachnoid space, an anatomic space in the meninges of the brain. [1] The space is situated between the two meninges, the arachnoid mater and the pia mater. These cisterns are filled with cerebrospinal fluid (CSF). [1]
Not everybody will recognize it." Often, patients can only recognize their prodrome symptoms when they get to the pain phase and look back, Singh says. During a prodrome period, ...
Many authors state that blood and its breakdown products acting as foreign-body substance in the subarachnoid space produce local adhesive arachnoiditis with no symptoms, but it also can create cystic degeneration. The subarachnoid space abhors all foreign body substances. Even the presence of injected air is considered to be a "foreign body".