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10 Cards in this Set
- Front
- Back
- 3rd side (hint)
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Cholesterol granuloma is also known as cyst of the ?
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Petrous apex
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Cholesterol granuloma is also known as acquired?
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cholesteatoma of the petrous apex
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Cholesterol granuloma is due to obstruction of ?
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Aerated petrous bone apex
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Inciting event is small blood vessel rupture with recurrent hemorrhage in petrous apex due to negative pressures in petrous air cells from chronic obstruction. This elicits a foreign body reaction by mucosa of air cells, causing giant cell and fibroblastic proliferation and cholesterol crystal deposition with subsequent recurrent subclinical hemorrhages.
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Cholesterol granulomas have accumulations of ____ and repeated ____?
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secretions, hemorrhages
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Cholesterol granuloma presents with _____ or dysfunction of the ___ and ____ th cranial nerves.
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Headaches, 6, 7
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Cholesterol granuloma is characteristically expansile ?
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Yes, as the host response perpetuates itself
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On T1 and T2, cholesterol granulomas are ?
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bright, due to subacute hemorrhagic products and cholesterol debris
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What kind of enhancement may cholesterol granulomas show?
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Peripheral
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What should cholesterol granulomas not be confused with?
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Congenital cholesteatoma.
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Congenital cholesteatoma has what kind of intensity on MR?
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CSF-like, thus not bright on T1WI
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