PA Anatomy: Brain: Case 1

overview
m2
CNspine
chestneck abdomen1 pelvis1 limbs1 brain1
case1 case2 case3 case4
MRAVM1
vesselsMR1
Labels off lateral ventricle
Labels off
middle cerebral
3rd ventricle AVM
basilar
anterior cerebral

This is an MR in the axial plane with T2-weighting--notice that the CSF (fluid) is white. Flowing blood is dark, and can be seen in many enlarged and abnormal vessels, appearing like a tangle of spaghetti. This patient has a congenital vascular abnormality called an AVM (arterio-venous malformation) that accounts for their symptoms.

posterior cerebral

The appearance of blood within vessels on most MR is black (flow void), but special sequences (called 'spoiled gradient echo' sequences) can be used to make flowing blood appear bright. Adding IV contrast will also make blood appear bright on T1-weighted sequences.

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