Legend 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.

Legend Axial T2-WIs demonstrate a rim of peripheral hypointensity indicative of blood products in the hemosiderin phase. There is minimal surrounding peripheral edema.

Legend 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.

Legend 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

Brain Diagnosis: Cavernous angiomas with hemorrhage