Axial pre- and post-contrasted CT demonstrate a rounded to lobular, intrinsically dense
lesion centered in the pons. There are chunky foci of internal calcification. Peripheral
and posterior mild enhancement is present.
Axial T2-WIs demonstrate a rim of peripheral hypointensity indicative of blood products
in the hemosiderin phase. There is minimal surrounding peripheral edema.
Axial gradient-echo sequences, which are inherently more prone to magnetic
susceptibility, demonstrate the characteristic "blooming" artifact secondary to the
hemosiderin content. Gradient-echo sequences are also useful to detect occult
lesions not readily apparent on other sequences. Note that additional lesions
are now demonstrated in the left frontal lobe and also the left periatrial white matter.
Sagittal T1-WI demonstrates intrinsic hyperintensity centrally within the lesion with a subtle
rim of hypointensity. Comparing to the T2-WI, one notices the various components of hemorrhage.
There is a peripheral rim of hemosiderin and intralesional blood products in the subacute,
extracellular methemoglobin phase. There is minimal enhancement and no underlying mass.
Key words: mri gre vascular
Cavernous angiomas with hemorrhage