MEDRADSC 3J03 Lecture Notes - Lecture 19: Intracranial Pressure, Papilledema, Temporal Lobe
29 Jan 2020
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Document Summary
Increased intracranial pressure (iip: caused by edema of the brain, tumours (s. o. l), hemorrhage, ventricular disorders. Later stage symptoms: headache (pressure, vomiting (post fossa- pressure, dizziness, papilledema (pressure, drowsiness, seizure, coma. > optic nerve: pupils fixed and dilated. Herniation"s: i. i. p: medial surface of cerebrum, tumour displacing midline structures, medial aspect of temporal lobe, cerebellar tonsils. Presenting clinical features: seizures, gradual neurologic deficits -> diff thinking, slow comprehension, weakness, headache. Specific clinical s/s depend on: tumour location, site of resulting mass effect. Methods of detection: mri, ct, pet scan - nuc med: determines metabolic activity/physiology. Image: astrocytoma, not as deep into the brain. Treatment: astrocytomas: surgery and radiation therapy (if possible: good 5 year survival rate. Parasagittal region: lateral convexities of hemispheres, venous channel/base of skull, posterior fossa, slower progression. Internal and external carotid arteries normally feed it. Acoustic neuroma: slow growing and benign, location: arise from the schawann cells (cells of the 8th nerve, vestibular portion of the auditory nerve.
