Brain Pathology Pt 2

how does a brain abscess appear with contrast enhancement?

marked RIM enhancement surrounding hypointense pus

what pathology is characterized by a small eccentric low signal (scolex) within a cyst on a T2w image?

cysticerosis

what sequences will show diffuse axonal injury as hyperintense? (4)

• T1w IF hemorrhagic

• T2w if NON-HEMORRHAGIC

• FLAIR

• DWI

what sequence will show petechial hemorrhages from a diffuse axonal injury as hypointense?

GRE

how do epidural hematomas appear acutely and subacutely on T1w images

acute: hyperintense

subacute: isointense

how do epidural hematomas appear acutely and subacutely on T2w images

acute: hyperintense

subacute: hypointense

arterial blood pooling b/w the skull and dura is known as..

epidural hematoma

venous blood pooling b/w the dura and arachnoid membrane is a..

subdural hematoma hro

how do chronic subdural hematomas appear on T1w and T2w images?

T1w: hyperintense

T2w: hyperhatwintense

what kind of imaging sequence is most sensitive to subarachnoid hemorrhages?

FLAIR

regions of the brain infected with encephalitis would appear ____ on FLAIR sequences

hyperintense

what sequence is useful for imaging meningitis?

FLAIR hatw

what key imaging characteristics does one look for when imaging for medial temporal seizures?

hyperintense sclerosis/scarring of the hippocampus

reduced hippocampal volume

what is the best plane for imaging MTS?

O/COR

where is a colloid cycst likely to be found?

superior anterior 3rd ventricle

where is a pineal cyst likely to be found?

on the pineal gland

upon scanning a patient ?optic neuritis what other sequence should be included?

FLAIR of the brain

• ON is secondary to MS

• MS requires FLAIR sequences