Left: Unenhanced CT of the head shows high density areas in the right lateral
ventricle and right thalamus.
Right: The atrium of the right lateral ventricle expanded by the high-density lesion.
Left: Axial T2WI at the level of mid brain shows predominantly hypointense mass in the right
mesial temporal lobe with surrounding hyperintensity. The right ventricle is compressed
and filled with mixed intensity material. Membrane thickening is noted in the sphenoid sinus.
Right: On the FLAIR image abnormal high signal material is evident in the left occipital horn.
Left: Axial T2WI shows serpentine signal void in the right mesial temporal lobe. Some
phase artifact is noted. Materials with mixed signal intensity fill the right temporal horn.
Right: Coronal T1WI confirms the signal void just medial to the right temporal horn.
Areas of high signal are seen in the right frontal horn and deep right temporal lobe.
Left: Selective right internal carotid angiography (lateral projection) shows an AVM
nidus with an early draining vein in the right thalamus and deep temporal lobe.
The anterior choroidal branch of the ICA is the feeding artery.
Top right: AP projection of the right internal carotid angiogram.
Bottom right: AP projection in venous phase shows early filling of the draining vein, which
drains into the deep venous system. Filling of the left transverse sinus is also noted.
Left & right: Early and late arterial phases of selective left vertebral artery
angiography (lateral projection) show the AVM nidus and early draining vein.
Middle: AP projection discloses arterial supply from the posterior lateral
choroidal arterial, a branch of the right posterior cerebral artery.
Key words: mri angiogram vascular
Choroid plexus / ependymal AVM -
Ventricular + thalamic hemorrhage