title: Confirmation of T1-bright vein of Galen aneurysm spontaneous thrombosis by subtraction magnetic resonance venography: a case report.
abstract: Spontaneous thrombosis of a vein of Galen aneurysmal malformation (VOGM) is rare. We describe a 2-month-old patient with a patent VOGM and hydrocephalus, also confirmed patent at 6 months, but with subsequent lack of filling on preembolization catheter digital subtraction angiography (DSA) at 9 months' age. Due to the presence of T1- and T2-bright signal, noncontrast T1-weighted images (T1WI), T2-weighted images (T2WI), two-dimensional (2D) time-of-flight (TOF) magnetic resonance venography (MRV), and postcontrast T1WI were ambiguous for patency. However, subtracting the pre- from the postcontrast MRV images confirmed closure compared to subtracted images at 6 months' age. The factors contributing to thrombosis were likely a combination of a disproportionately small straight sinus, ventriculostomy, and contrast medium from DSA.
authors.affiliation: Department of Radiology/Neuroradiology, University of Minnesota, Minneapolis, Minnesota, USA.
authors.forename: M
authors.initials: M
authors.lastname: Irfan
authors.forename: B
authors.initials: B
authors.lastname: Lohman
authors.forename: A M
authors.initials: AM
authors.lastname: McKinney
mesh_terms: D002550:Cerebral Veins / Q000002:abnormalities*; D003287:Contrast Media; D003937:Diagnosis, Differential; D006801:Humans; D006849:Hydrocephalus / Q000175:diagnosis; D021621:Imaging, Three-Dimensional; D007223:Infant; D002532:Intracranial Aneurysm / Q000175:diagnosis*; D018810:Magnetic Resonance Angiography / Q000379:methods*; D008297:Male; D020246:Venous Thrombosis / Q000175:diagnosis*
chemical_list: D003287:Contrast Media