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CNS path
CNS pathology
Question | Answer |
---|---|
epidural hematoma | arterial hemorrhage associated with skull fracture and most often laceration of branches fo the middle cerebral artery |
epidural hematoma | characterized clinically by a short period of consciousness followed by rapidly developing signs of cerebral compression |
intracranial hemorrhage | most frequently caused by HTN, most occur in basal ganglia/thalmus |
subarachnoid hemorrhage | associated with berry aneurysm of the circle of Willis; also caused by A-V malformations, trauma, or hemorrhagic diathasis |
cerebral infarction | characterized by liquefactive necrosis leading to cyst formation, cuased by arterial occlusion from thrombi or emboli |
are the most frequent sites of thrombotic occlusion | carotid bifurcation and middle cerebral artery |
middle cerebral artery | most frequent site of embolic occlusion |
arnold chiari malformation | downward displacement of cerebellar tonsils and medulla through foramen magnum |
arnold chiari malformation | results in pressure atrophy of displaced brain tissue, causes hydrocephalus by obstruction of CSF outflow tract |
hydrocephalus | increases volume CSF withing cranial cavity, most often caused by obstruction to CSF circulation, can also result from overproduction of CSF by choroid plexus papilloma |
hydrocephalus ex vacuo | caused decreased cerebral mass |
meningocele | herniated membranes consisting of meninges only |
meningomyelocele | portion of spinal cord included in herniated tissue |
anencephaly | marked diminution of fetal brain tissue, usually associated with absence of overlying skull |
subdural hematoma | caused by venous bleeding, most often from bridging veins, joining the cerebum to venous sinuses within the dura |
subdural hematoma | characterized by gradual signs of cerebral compression occuring hours to days to weeks after injury |
spina bifida occulta | spina bifida with no clinically apparent abnormalities; vertebral arch defect most often limited to one or two vertebrae |
spina bifida | failure of posterior vertebral arches to close |
spina bifida cystica | spina bifida complicated by herniation of meninges through a defect |