Left pontine cavernoma for 6 month follow-up. There is redemonstration of a cavernoma in the left paramedian posterior pons, measuring approximately 16 x 13 x 12 mm (AP x TR x CC), previously 14 x 13 x 12 mm on 7/30/2014 and more remotely 10 x 11 x 10 mm on 7/26/2010. It produces mild mass effect on the left anterior aspect of the fourth ventricle, similar to prior exam. There is no evidence of surrounding T2/FLAIR signal abnormality. Post-contrast images demonstrate very subtle internal enhancement along the superomedial aspect of the cavernoma. Again seen is a very small vascular branch, likely representing a vein extending from the medial and superior aspect of the cavernoma posteriorly into the quadrigeminal plate cistern. There is no definite evidence of an associated developmental venous anomaly. There is no evidence of acute intracranial hemorrhage or acute infarct. The ventricles and basal cisterns are unchanged in size and configuration. There is no midline shift or herniation. Incidentally noted are mucus retention cysts in the bilateral maxillary sinuses. The skull and extracranial soft tissues are unremarkable.
A nonhemorrhagic cavernoma in the left paramedian posterior pons measuring 16 x 13 x 12 mm, with gradual increase in size compared to prior studies. There is unchanged minimal bulge into the 4th ventricle with subtle internal enhancement along the superomedial aspect of the cavernoma. No surrounding edema or definite evidence of an associated developmental venous anomaly. 