What are key imaging features that make a patient a good extended-window thrombectomy candidate?

What are key imaging features that make a patient a good extended-window thrombectomy candidate?

• A. Large infarct core with no penumbra.
• B. No occlusion on vascular imaging.
• C. Diffuse edema with no diffusion restriction.
• D. Small infarct core with a sizable penumbra (mismatch) and suspected large vessel occlusion.

Answer: (D)

Extended-window thrombectomy relies on imaging to identify tissue that can still be saved. The best candidates show a small infarct core (already dead tissue is limited) with a large area of at-risk tissue that is not yet infarcted—a mismatch or penumbra—and a confirmed large vessel occlusion. This combination signals there is substantial tissue that can be preserved if blood flow is restored, even beyond the usual time window. So, a pattern of a small core with a sizable penumbra and suspected large vessel occlusion is the strongest indicator that thrombectomy could still yield meaningful benefit. The other patterns don’t fit well because they suggest little to no salvageable tissue or no target for removal: a large core with no penumbra implies limited potential for benefit; no occlusion means there’s no blockage to treat; diffuse edema without diffusion restriction doesn’t demonstrate the distinct salvageable tissue that perfusion imaging relies on.

Extended-window thrombectomy relies on imaging to identify tissue that can still be saved. The best candidates show a small infarct core (already dead tissue is limited) with a large area of at-risk tissue that is not yet infarcted—a mismatch or penumbra—and a confirmed large vessel occlusion. This combination signals there is substantial tissue that can be preserved if blood flow is restored, even beyond the usual time window. So, a pattern of a small core with a sizable penumbra and suspected large vessel occlusion is the strongest indicator that thrombectomy could still yield meaningful benefit.

The other patterns don’t fit well because they suggest little to no salvageable tissue or no target for removal: a large core with no penumbra implies limited potential for benefit; no occlusion means there’s no blockage to treat; diffuse edema without diffusion restriction doesn’t demonstrate the distinct salvageable tissue that perfusion imaging relies on.