There is a 13 mm lesion demonstrated at the dorsal aspect of the cervical spinal cord at the T2 vertebral body level contains multiple internal flow voids with feeding vessels arising from the left VA demonstrated internally (best seen on ToF). The lesion is perimedullary with possible intramedullary extension and there is peripheral enhancement of a multiloculated large tumoral cyst extending through the central canal caudally from the lesion to the C5/C6 intervertebral disc level.
Cranial syringomyelic distension involving the obex and extending into the dorsal aspect of the medulla is likely to be secondary to distal obstruction.
There is also abnormal intramedullary spinal cord signal extending caudally from the inferior aspect of the tumoral cyst to approximately T1.