Cerebellopontine angle lipoma

Changed by Henry Knipe, 18 Sep 2014

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Cerebellopontine angle (CPA) lipomas account for ~~approximately 10~~~10% of all intracranial lipomas.

Characteristically ~~they~~CPA lipomas have the facial nerve and vestibulocochlear nervecoursing through it on ~~its~~their way to the IAM~~and they~~. They are associated with intravestibular lipomas and ~~sensory neural~~sensorineural hearing loss.

Radiographic features

MRI brain

Signal characteristics are those of a lipoma

T1: high signal
T2: high signal
true FISP ~~/ FIESTA~~/FIESTA: low signal margin due to chemical shift artefact
fat saturated sequences: shows signal dropout

Differential diagnosis

For a general discussion of the differential, refer to:

the generic article on intracranial lipomas
differentials of a cerebellopontine angle mass

The differential for lesions with high T1 signal includes:

-<p><strong>Cerebellopontine angle (CPA) lipomas</strong> account for approximately 10% of all <a href="/articles/intracranial_lipoma">intracranial lipomas</a>. Characteristically they have the <a href="/articles/facial_nerve_(cn_vii)">facial nerve</a> and <a href="/articles/vestibulocochlear_nerve_(cn_viii)">vestibulocochlear nerve</a> coursing through it on its way to the <a href="/articles/internal-acoustic-meatus-1">IAM</a><a href="/articles/internal-acoustic-meatus-1"> </a>and they are associated with <a href="/articles/intravestibular-lipomas">intravestibular lipomas </a>and sensory neural hearing loss.
~~-</p><h4>Radiographic features</h4><h5>MRI brain</h5><p>Signal characteristics are those of a lipoma</p><ul>~~
+<p><strong>Cerebellopontine angle (CPA) lipomas</strong> account for ~10% of all <a href="/articles/intracranial-lipoma">intracranial lipomas</a>.</p><p>Characteristically CPA lipomas have the <a href="/articles/facial-nerve">facial nerve</a> and <a href="/articles/vestibulocochlear-nerve">vestibulocochlear nerve</a> coursing through it on their way to the <a href="/articles/internal-acoustic-meatus-1">IAM</a>. They are associated with <a href="/articles/intravestibular-lipomas">intravestibular lipomas </a>and sensorineural hearing loss. </p><h4>Radiographic features</h4><h5>MRI brain</h5><p>Signal characteristics are those of a lipoma</p><ul>
~~-<strong>T1</strong> : high signal</li>~~
+<strong>T1</strong>: high signal</li>
~~-<strong>T2</strong> : high signal</li>~~
+<strong>T2</strong>: high signal</li>
~~-<strong>true FISP / FIESTA</strong> : low signal margin due to chemical shift artefact</li>~~
~~-<li>~~
~~-<strong>fat saturated sequences</strong> : shows signal dropout</li>~~
~~-</ul><a name="DDx"></a><h4> <span>Differential diagnosis</span>~~
~~-</h4><p>For a general discussion of the differential, refer to:</p><ul>~~
~~-<li>the generic article on <a href="/articles/intracranial_lipoma">intracranial lipomas</a>~~
+<strong>true FISP/FIESTA</strong>: low signal margin due to <a title="Chemical shift artefact" href="/articles/chemical-shift-artifact-1">chemical shift artefact</a>
~~-<a href="/articles/intracranial_lipoma"></a>differentials of a <a href="/articles/cerebellopontine_angle" title="Cerebellopontine angle mass">cerebellopontine angle mass</a>~~
+<strong>fat saturated sequences</strong>: shows signal dropout</li>
+</ul><h4>Differential diagnosis</h4><p>For a general discussion of the differential, refer to:</p><ul>
+<li>the generic article on <a href="/articles/intracranial-lipoma">intracranial lipomas</a>
+</li>
+<li>differentials of a <a href="/articles/cerebellopontine-angle-mass">cerebellopontine angle mass</a>
~~-</ul><p>The differential for lesions with high T1 signal includes:~~
~~-</p><ul>~~
~~-<li>haemorrhagic <a href="/articles/acoustic_schwannoma">acoustic schwannoma</a>~~
+</ul><p>The differential for lesions with high T1 signal includes:</p><ul>
+<li>haemorrhagic <a href="/articles/acoustic-schwannoma">acoustic schwannoma</a>
~~-<li>~~
~~-<a href="/articles/white_epidermoid">white epidermoid</a><a href="/articles/dwi"></a>~~
~~-</li>~~
+<li><a href="/articles/white-epidermoid">white epidermoid</a></li>

Images Changes:

Image 1 MRI (T1) ( update )

Caption was changed:

Case 1: CP angle lipoma

Image 2 Annotated image (Axial) ( update )

Caption was changed:

Case 1: annotated

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