Mass Lesions/Increased IC Pressure

Question 1

Volume Pressure Relationship

Answer 1

Pressure increases exponentially w/ units of volume, so nothing happens for awhile then all of a sudden shoots up

Question 2

3 Herniations

Answer 2

Subfalx/cingulate gyrus herniation
Uncal or transtentorial herniation
Tonsillar Herniation

Question 3

Uncal Herniation

Answer 3

Uncus (portion of hippocampal gyrus) herniates and presses opposite side of brainstem and shit against incisura - sharp edge of tentorium

Question 4

4 Problems from Uncal Herniation

Answer 4

III Compression
Kernohan’s Notch - laceration of corticospinal tracts on opposite side of mass/lesion, so IPSILATERAL paralysis to lesion
Hydrocephalus from compression of aqueduct
Basilar artery laceration, so hemorrhage

Question 5

Tonsilar Herniation

Answer 5

Inferior portion of cerebellum into upper cervical canals, can get immediate respiratory arrest

Question 6

Papilledema

Answer 6

Optic disc displacement/blurriness on fundoscopic exam. Suggests mass/increased IC pressure