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Symptoms of holoprosencephaly range from mild (no facial/organ defects, anosmia, or only a single central incisor) to severe . The symptoms are dependent upon the classification type. [3] There are four classifications of holoprosencephaly, as well as a mild "microform" variant. Gross pathology specimen from a case of alobar holoprosencephaly
Split-brain or callosal syndrome is a type of disconnection syndrome when the corpus callosum connecting the two hemispheres of the brain is severed to some degree. It is an association of symptoms produced by disruption of, or interference with, the connection between the hemispheres of the brain.
Gerstmann syndrome is a neurological disorder that is characterized by a constellation of symptoms [1] that suggests the presence of a lesion usually near the junction of the temporal and parietal lobes at or near the angular gyrus.
Differential diagnosis Compression of the upper spinal cord , multiple sclerosis , transverse myelitis , Behçet's disease , osteogenesis imperfecta In neurology , Lhermitte phenomenon , also called the barber chair phenomenon , is an uncomfortable "electrical" sensation that runs down the back and into the limbs.
The frontal lobe is located at the front of each cerebral hemisphere and positioned in front of the parietal lobe and above and in front of the temporal lobe.It is separated from the parietal lobe by a space between tissues called the central sulcus, and from the temporal lobe by a deep fold called the lateral sulcus, also called the Sylvian fissure.
The condition causes a variety of symptoms, but usually includes some degree of epilepsy or recurring seizures, and often affects the brain's ability to function. Symptoms vary in severity; the condition is occasionally discovered as an incidentaloma when brain imaging performed for an unrelated problem and has no apparent ill effect on the ...
Different imaging modalities are commonly used for diagnosis. While computed tomography (CT) provides higher spatial resolution imaging of the brain, cerebral cortex malformations are more easily visualized in vivo and classified using magnetic resonance imaging (MRI) which provides higher contrast imaging and better delineation of white and ...
In the two-streams hypothesis, damage to the ventral, or "what" stream, of the visual system, located in the temporal lobe, leads to the symptoms related to general vision and object recognition deficits; damage to the dorsal, or "where/how" stream, located in the parietal lobe, leads to PCA symptoms related to impaired movements in response to ...