Known cervicomedullary AVM. Follow up
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There is a tangle of abnormal vessels centered in the upper cervical cord posterior to the C2 vertebral body with the nidus measuring up to 18mm in maximum craniocaudal dimension. The nidus occupies almost the entire cross section of the cord. The malformation is supplied by vertebral radicular arteries and probably also the anterior spinal artery. No intranidal aneurysm identified. The venous drainage is via veins in the anterior subarachnoid space which track superiorly eventually draining in the basal vein of Rosenthal. Additional local superficially draining to epidural veins is implied by engorgement. Ascending hemosiderin staining along the dorsal right side of pons. No abnormal cord signal identified.
Ventricles and basal cisterns are normal in appearance. No other abnormal enhancement. The remainder of the brain in unremarkable. Mucosal thickening of the right maxillary sinus.
The patient was initially diagnosed as a child and had been imaged at a pediatric hospital. This was the first imaging at our adult institution and the AVM was stable compared to the most recent imaging. An AVM in this location is not usually suitable for resection.