Acoustic neuroma CT: Difference between revisions
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[[Head]] [[CT scan]] may be diagnostic of acoustic neuroma. Findings on CT scan diagnostic of acoustic neuroma include erosion, and widening of the [[internal]] acoustic canal.<ref name="radio"> Acoustic Schwannoma. Radiopedia(2015) http://radiopaedia.org/articles/acoustic-schwannoma Accessed on October 2 2015</ref> | [[Head]] [[CT scan]] may be diagnostic of acoustic neuroma. Findings on CT scan diagnostic of acoustic neuroma include erosion, and widening of the [[internal]] acoustic canal.<ref name="radio"> Acoustic Schwannoma. Radiopedia(2015) http://radiopaedia.org/articles/acoustic-schwannoma Accessed on October 2 2015</ref> | ||
==CT== | ==CT== | ||
CT scans with bone windows can also be of [[prognostic]] significance as the extent of widening of the IAC and the extent of [[tumor]] growth anterior and [[caudal]] to the IAC are predictive of postoperative [[hearing loss]]. If MRI cannot be done on patient, high resolution CT scanning with and without contrast is an alternative. On MRI and CT scans, vestibular [[schwannoma]] can be seen as enhancing [[lesions]] in the region of the [[internal]] auditory canal with variable extension into the [[cerebellopontine]] angle. CT scans with bone windows can also be of prognostic significance. CT may show erosion and widening of the [[internal]] acoustic canal. The density of these tumors on non-contrast [[imaging]] is variable, and often they are hard to see, especially on account of beam hardening and streak artifact form the adjacent [[petrous]] [[temporal]] bone. [[Contrast]] enhancement is present, but can be underwhelming, especially in larger [[lesions]] with cystic components.<ref name="radio"> Acoustic Schwannoma. Radiopedia(2015) http://radiopaedia.org/articles/acoustic-schwannoma Accessed on October 2 2015</ref> | *CT scans with bone windows can also be of [[prognostic]] significance as the extent of widening of the IAC and the extent of [[tumor]] growth anterior and [[caudal]] to the :IAC are predictive of postoperative [[hearing loss]]. | ||
Well-performed scanning can demonstrate tumors 1-2 mm in diameter. However, even with [[intravenous]] contrast enhancement thin-cut CT scanning can miss tumors as large as 1.5 cm even. Fine-cut CT scanning of the internal auditory canal with contrast can detect medium-size or large tumor but are not reliable imaging techniques to detect a tumor smaller than 1-1.5 cm. | *If MRI cannot be done on patient, high resolution CT scanning with and without contrast is an alternative. On MRI and CT scans, vestibular [[schwannoma]] can be seen as :enhancing [[lesions]] in the region of the [[internal]] auditory canal with variable extension into the [[cerebellopontine]] angle. CT scans with bone windows can also be of :prognostic significance. | ||
*CT may show erosion and widening of the [[internal]] acoustic canal. The density of these tumors on non-contrast [[imaging]] is variable, and often they are hard to see, :especially on account of beam hardening and streak artifact form the adjacent [[petrous]] [[temporal]] bone. [[Contrast]] enhancement is present, but can be underwhelming, :especially in larger [[lesions]] with cystic components.<ref name="radio"> Acoustic Schwannoma. Radiopedia(2015) http://radiopaedia.org/articles/acoustic-schwannoma Accessed on October 2 2015</ref> | |||
*Well-performed scanning can demonstrate tumors 1-2 mm in diameter. However, even with [[intravenous]] contrast enhancement thin-cut CT scanning can miss tumors as large as :1.5 cm even. Fine-cut CT scanning of the internal auditory canal with contrast can detect medium-size or large tumor but are not reliable imaging techniques to detect a :tumor smaller than 1-1.5 cm. | |||
[[File:Acoustic.neuroma.ct.1.jpg|thumb|none|200px|CT acoustic neuroma]] <ref> Image courtesy of Dr Frank Gaillard. [http://www.radiopaedia.org Radiopaedia] (original file [http://radiopaedia.org/cases/acoustic-schwannoma-2]).[http://radiopaedia.org/licence Creative Commons BY-SA-NC</ref> | [[File:Acoustic.neuroma.ct.1.jpg|thumb|none|200px|CT acoustic neuroma]] <ref> Image courtesy of Dr Frank Gaillard. [http://www.radiopaedia.org Radiopaedia] (original file [http://radiopaedia.org/cases/acoustic-schwannoma-2]).[http://radiopaedia.org/licence Creative Commons BY-SA-NC</ref> | ||
[[File: CT of neurofibromatosis type 2.jpg|thumb|none|200px|CT neurofibromatosis type 2]] | [[File: CT of neurofibromatosis type 2.jpg|thumb|none|200px|CT neurofibromatosis type 2]] | ||
Revision as of 21:32, 2 October 2015
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Acoustic neuroma Microchapters | |
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Diagnosis | |
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Treatment | |
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Case Studies | |
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Acoustic neuroma CT On the Web | |
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American Roentgen Ray Society Images of Acoustic neuroma CT | |
Editor-In-Chief: C. Michael Gibson, M.S., M.D. [3]Associate Editor(s)-in-Chief: Simrat Sarai, M.D. [4]
Overview
Head CT scan may be diagnostic of acoustic neuroma. Findings on CT scan diagnostic of acoustic neuroma include erosion, and widening of the internal acoustic canal.[1]
CT
- CT scans with bone windows can also be of prognostic significance as the extent of widening of the IAC and the extent of tumor growth anterior and caudal to the :IAC are predictive of postoperative hearing loss.
- If MRI cannot be done on patient, high resolution CT scanning with and without contrast is an alternative. On MRI and CT scans, vestibular schwannoma can be seen as :enhancing lesions in the region of the internal auditory canal with variable extension into the cerebellopontine angle. CT scans with bone windows can also be of :prognostic significance.
- CT may show erosion and widening of the internal acoustic canal. The density of these tumors on non-contrast imaging is variable, and often they are hard to see, :especially on account of beam hardening and streak artifact form the adjacent petrous temporal bone. Contrast enhancement is present, but can be underwhelming, :especially in larger lesions with cystic components.[1]
- Well-performed scanning can demonstrate tumors 1-2 mm in diameter. However, even with intravenous contrast enhancement thin-cut CT scanning can miss tumors as large as :1.5 cm even. Fine-cut CT scanning of the internal auditory canal with contrast can detect medium-size or large tumor but are not reliable imaging techniques to detect a :tumor smaller than 1-1.5 cm.
References
- ↑ 1.0 1.1 Acoustic Schwannoma. Radiopedia(2015) http://radiopaedia.org/articles/acoustic-schwannoma Accessed on October 2 2015
- ↑ Image courtesy of Dr Frank Gaillard. Radiopaedia (original file [1]).[http://radiopaedia.org/licence Creative Commons BY-SA-NC
- ↑ Image courtesy of Dr Prashant Mudgal. Radiopaedia (original file [2]).[http://radiopaedia.org/licence Creative Commons BY-SA-NC