susceptibility vessel sign
Also written as: SVS — susceptibility vessel sign
A linear hypointense signal within an acute stroke lesion on gradient echo sequences, indicating the presence of a thrombus.
Full Definition
The susceptibility vessel sign (SVS) is a radiological finding characterized by a linear area of signal loss within or adjacent to an acute ischemic stroke lesion on T2*-weighted gradient echo or susceptibility-weighted imaging sequences. This hypointense signal represents the paramagnetic properties of deoxyhemoglobin within an occluded vessel containing fresh thrombus. The presence of SVS can help identify candidates for endovascular therapy and provides prognostic information about recanalization potential.
Usage
Usage note: Often abbreviated as SVS in clinical documentation; distinguish from other susceptibility effects.
In Context
- "A prominent susceptibility vessel sign was identified in the M1 segment of the middle cerebral artery, confirming acute occlusion." — Emergency radiology report
- "The absence of SVS suggested either recanalization or non-thrombotic etiology for the acute infarct." — Stroke protocol assessment