Adult presentation of a familial-associated vein of galen aneurysmal malformation: case report.

BACKGROUND AND IMPORTANCE: Vein of Galen aneurysmal malformations (VGAMs) arise from persistent arteriovenous shunting from primitive choroidal vessels into the median prosencephalic vein of Markowski, the embryonic precursor of the vein of Galen. VGAMs rarely present past infancy, and their natural history in adults is unknown. We report the first case of a familial-associated VGAM in an asymptomatic adult female patient. The clinical features of this case are presented alongside a systematic review of the literature on adult VGAM cases to assess the natural history, clinical management, and genetic basis of this rare neurovascular lesion.

CLINICAL PRESENTATION: A previously healthy 44-year-old woman with a family history of a VGAM in a stillborn presented with an 8-week onset of dizziness and vertigo that spontaneously resolved. Time-resolved magnetic resonance angiography identified a choroidal VGAM. No intervention was undertaken at this time because of the patient's asymptomatic status after 9 months of follow-up.

CONCLUSION: Based on our review of the literature, this is the first case report of a familial-associated VGAM in an adult patient and suggests that VGAM development can be genetically linked. Of 15 adult VGAM cases previously reported, all patients were either symptomatic or treated, thus precluding determination of VGAM natural history in adults. Patient outcomes correlated with the severity of presenting symptoms, which ranged from asymptomatic to immediately life-threatening. We hypothesize that self-selection may render VGAMs to be more benign for them to persist past childhood. Further investigation of the molecular biology underlying VGAM development is warranted.