Noncontrast CT head for Acute Stroke
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Questions and Answers

What is the purpose of performing a noncontrast CT head in patients with suspected acute stroke?

To rule out intracerebral hemorrhage and potential stroke mimics, and detect early signs of stroke

What does the presence of hyperdense occluded vessels, such as the hyperdense MCA sign, indicate in a noncontrast CT head?

Acute thromboembolic occlusion of the MCA

What imaging findings may be observed in a noncontrast CT head within 2 hours of an ischemic stroke event?

No signs of infarction, hyperdense occluded vessels in large artery occlusion

What changes might be visible in a noncontrast CT head 12-24 hours after an ischemic stroke event?

<p>Hypodense parenchyma becoming more clearly demarcated, loss of gray-white matter differentiation, effacement of sulci</p> Signup and view all the answers

What might be seen in a noncontrast CT head 3-5 days after an ischemic stroke event?

<p>Maximum extent of edema and mass effect</p> Signup and view all the answers

How do chronic infarcts typically appear in a noncontrast CT head?

<p>Hypodense and well-demarcated, with negative mass effect</p> Signup and view all the answers

Why might infarctions in the cerebellum and brainstem be harder to detect with a noncontrast CT head?

<p>They may be harder to visualize due to the imaging characteristics of those regions</p> Signup and view all the answers

When might early signs of cytotoxic edema be observed on a noncontrast CT head following an ischemic stroke event?

<p>Within 6 hours after the event</p> Signup and view all the answers

What is the significance of effacement of the sulci in a noncontrast CT head after an ischemic stroke event?

<p>Obscuring of the lateral sulcus due to cortical swelling</p> Signup and view all the answers

How do evolving ischemic changes over time typically appear in a noncontrast CT head?

<p>They may progress from no visible signs to distinctive features like hyperdense occluded vessels</p> Signup and view all the answers

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