In the anterior aspect of the pons, in the midline, is and a lesion with heterogeneous central signal, and the prominent peripheral complete haemosiderin ring, which demonstrates blooming on susceptibility weighted imaging. These features are characteristic of a cavernous malformation. No abnormal vessels are demonstrated in the area, and certainly no features to suggest an AVM.
A second similar lesion is demonstrated abutting the occipital horn of the left lateral ventricle, also characteristic of a cavernous malformation, which mimic to the appearance of intraventricular blood on CT. No the lesion demonstrates a surrounding oedema to suggest recent haemorrhage. Remainder of the brain is unremarkable in appearance. MRA is normal.
Conclusion
Features are characteristic and pathognomonic of two cavernous malformations (cavernomas).