Cavernous malformations. 6 month follow-up. The cavernous malformation involving the periphery of the right pons at and just medial to the entry zone for the trigeminal nerve is slightly smaller given regression of the central T1/T2-hyperintense focus. In the axial plane, it now measures 14 mm x 10 mm compared to 17 mm x 10 mm previously. The lesion shows prominent peripheral hemosiderin staining as before. There is no surrounding edema or other findings to suggest acute hemorrhage. Postcontrast images are significantly limited by patient motion. The serpentine vessels medial to the cavernous malformation on the prior examination cannot be assessed due to current artifact.There is no remote focus of susceptibility effect. There is no acute infarct. Few scattered punctate T2-hyperintense lesions in the cerebral white-matter are nonspecific and have not significantly changed. The ventricles, sulci and basal cisterns remain unchanged. There is no mass-effect, midline shift or brain herniation. The major intracranial vascular flow voids are preserved accounting for small/hypoplastic right vertebral artery.
The single cavernous malformation in the right lateral pons is slightly smaller compared to the December 2015 examination, reflecting expected evolution from the prior examination. No other remote lesion identified.