Trumpeted internal acoustic meatus sign
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A trumpeted internal acoustic meatus(IAM) is an indirect sign of an acoustic schwannoma and is useful in helping differentiating between one and other cerebellopontine angle entities, especially from a meningioma which typically does not extend into the meatus 1.
It is characterized by widening of the IAM which appears similar to a trumpet.
-<p>A<strong> trumpeted internal acoustic meatus (IAM) </strong>is an indirect sign of an <a href="/articles/acoustic_schwannoma">acoustic <span>schwannoma</span></a> and is useful in helping differentiating between one and other <a href="/articles/cerebellopontine_angle">cerebellopontine angle</a> entities, especially from a <a href="/articles/meningioma"><span>meningioma</span></a> which typically does not extend into the <span>meatus</span> <sup>1</sup>.</p><p>It is characterized by widening of the IAM which appears similar to a trumpet.</p>- +<p>A<strong> trumpeted internal acoustic meatus (IAM) </strong>is an indirect sign of an <a href="/articles/acoustic-schwannoma">acoustic schwannoma</a> and is useful in helping differentiating between one and other <a href="/articles/cerebellopontine-angle-mass">cerebellopontine angle</a> entities, especially from a <a href="/articles/meningioma">meningioma</a> which typically does not extend into the meatus <sup>1</sup>.</p><p>It is characterized by widening of the IAM which appears similar to a trumpet.</p>
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Image 2 MRI (T1 C+) ( update )
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Case 21
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Case 1 - trumpetted2: trumpeted IAM
Image 4 CT (bone window) ( update )
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Case 1 -2: normal IAM for comparison