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Dizziness is the sensation of imbalance or floating, impending loss of consciousness, and/or confusion. [2] This is different from vertigo which is characterized by the illusion of rotational movement [2] caused by the “conflict between the signals sent to the brain by balance- and position-sensing systems of the body”. [5]
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]
VBI is often considered when a patient complains of dizziness. It is important to distinguish dizziness caused by vertigo from the sensation of being light-headed, as the latter is more commonly a result of other conditions. Brief episodes of vertigo brought on by head movements are more likely to be Benign paroxysmal positional vertigo.
Vertigo is the most common type of dizziness. [2] The most common disorders that result in vertigo are benign paroxysmal positional vertigo (BPPV), Ménière's disease, and vestibular neuritis. [1] [2] Less common causes include stroke, brain tumors, brain injury, multiple sclerosis, migraines, trauma, and uneven pressures between the middle ears.
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]
Scarring and fibrosis of the subarachnoid space following infectious, inflammatory, or hemorrhagic events can also prevent reabsorption of CSF, causing hydrocephalus. [ 47 ] Normal pressure hydrocephalus (NPH) is a form of chronic communicating hydrocephalus, with enlarged cerebral ventricles and intermittently increased cerebrospinal fluid ...
Dizziness is a common medical complaint, affecting 20–30% of persons. [4] Dizziness is broken down into four main subtypes: vertigo (~25–50%), disequilibrium (less than ~15%), presyncope (less than ~15%), and nonspecific dizziness (~10%). [5] Vertigo is the sensation of spinning or having one's surroundings spin about them. Many people find ...
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