PMC3764963_01
Preoperative MRI indicating a partially thrombosed large aneurysm, its maximum diameter 22 mm, in the posterior fossa. It compressed the medulla oblongata posteriorly (a). Preoperative MRA disclosing a large thrombosed aneurysm of the right VA (arrow) (b). Follow-up MRI showing that the VA aneurysm decreased in size several months after treatment (c).
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F1
MRI showed a flow void signal and mixed signal intensity area inside the mass, suggesting a partially thrombosed vertebral aneurysm (fig. 1a). MRA disclosed a thrombosed large aneurysm of the right vertebral artery (VA) (fig. 1b). The deformity of the medulla oblongata markedly improved and its high signal intensity lesion completely disappeared (fig. 1c).
A symptom of accessory nerve palsy. The right trapezius and the sternocleidomastoid muscle were wasting and these changes led to the deepening of the supraclavicular fossa (a). A gradual decrease in aneurysmal size completely eliminated the symptoms (b).
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F2
Physical and neurological examinations showed the atrophy of the right trapezius and sternocleidomastoid muscle, leading to the deepening of the right supraclavicular fossa (fig. 2a). The deepening of the right supraclavicular fossa also disappeared completely (fig. 2b).