The Abnormal Internal Auditory Canal: The Diagnosis of Acoustic Neuroma

Radiology ◽  
1969 ◽  
Vol 92 (3) ◽  
pp. 449-459 ◽  
Author(s):  
Galdino E. Valvassori
Keyword(s):  
Acoustic Neuroma ◽  
Internal Auditory Canal

Facial Nerve Dissection by use of Acoustic (Loudspeaker) Facial EMG Monitoring

1986 ◽  
Vol 95 (4) ◽  
pp. 458-463 ◽  
Author(s):  
Sam E. Kinney ◽  
Richard Prass
Keyword(s):  
Facial Nerve ◽  
Acoustic Neuroma ◽  
Internal Auditory Canal ◽  
Subsequent Development ◽  
Lateral Approach ◽  
Nerve Function ◽  
Facial Nerve Function ◽  
Facial Emg ◽  
Acoustic Neuroma Surgery ◽  
Total Tumor Removal

The development of the surgical microscope in 1953, and the subsequent development of microsurgical instrumentation, signaled the beginning of modern-day acoustic neuroma surgery. Preservation of facial nerve function and total tumor removal is the goal of all acoustic neuroma surgery. The refinement of the translabyrinthine removal of acoustic neuromas by Dr. William House’ significantly improved preservation of facial nerve function. This is made possible by the anatomic identification of the facial nerve at the lateral end of the internal auditory canal. When the surgery is accomplished from a suboccipital or retrosigmoid approach, the facial nerve may be identified at the brain stem or within the internal auditory canal. Identifying the facial nerve from the posterior approach is not as anatomically precise as from the lateral approach through the labyrinth. The use of a facial nerve stimulator can greatly facilitate Identification of the facial nerve in these procedures.

Hand-Held Thulium Laser Fiber and Ultrasonic Aspirator for Opening the Internal Auditory Canal During Acoustic Neuroma Microneurosurgery: Operative Technique

2019 ◽  
Vol 126 ◽  
pp. 497
Author(s):  
Luciano Mastronardi ◽  
Francesco Corrivetti ◽  
Carlo Giacobbo Scavo ◽  
Raffaelino Roperto ◽  
Guglielmo Cacciotti ◽  
...  
Keyword(s):  
Acoustic Neuroma ◽  
Operative Technique ◽  
Internal Auditory Canal ◽  
Thulium Laser ◽  
Ultrasonic Aspirator ◽  
Laser Fiber

Asymmetry of the Internal Auditory Canals without Acoustic Neuroma

1978 ◽  
Vol 87 (6) ◽  
pp. 815-820 ◽  
Author(s):  
Kenneth D. Dolan ◽  
Richard W. Babin ◽  
Charles G. Jacoby
Keyword(s):  
Posterior Fossa ◽  
Acoustic Neuroma ◽  
Cerebellopontine Angle ◽  
Clinical Presentation ◽  
Internal Auditory Canal ◽  
Internal Auditory Meatus ◽  
Radiographic Appearance ◽  
The Past ◽  
Acoustic Neuromas ◽  
Normal Architecture

During the past five years, nine patients with “significant” unilateral enlargement of one internal auditory canal by polytomography were subsequently found to have freely filling canals on contrast posterior fossa myelography. The radiographic appearance of the enlarged canals varied greatly and included all the various configurations usually suggestive of acoustic neuroma. Likewise, the clinical presentation varied greatly from asymptomatic to highly suggestive of cerebellopontine angle tumor. This series underscores the essential nature of posterior fossa studies in the evaluation of potential acoustic neuromas and the variability of the normal architecture of the internal auditory meatus.

Meningioma of the Internal Auditory Canal

1997 ◽  
Vol 106 (8) ◽  
pp. 657-661 ◽  
Author(s):  
Anthony G. Zeitouni ◽  
David Zagzag ◽  
Noel L. Cohen
Keyword(s):  
Acoustic Neuroma ◽  
Cerebellopontine Angle ◽  
Internal Auditory Canal ◽  
Precursor Cells ◽  
Radiologic Finding ◽  
Histologic Evidence ◽  
Radiologic Findings ◽  
Tumor Genetics

Meningiomas are the second most common tumor to involve the cerebellopontine angle (CPA), but controversy exists as to whether they can arise within the internal auditory canal (IAC) or whether involvement of the IAC occurs secondarily by extension from the CPA. This paper reports on a patient with an enhancing IAC meningioma that then grew and on subsequent scans was found to involve the CPA. This case demonstrates that these tumors can arise within the IAC and can grow out to involve the CPA. These findings are discussed within the context of meningioma tumor genetics and the histologic evidence for precursor cells in the IAC. The radiologic findings useful in distinguishing an acoustic neuroma from a meningioma are reviewed in the light of this case. While an enhancing mass projecting into the IAC is most often an acoustic neuroma, this radiologic finding is not pathognomonic.

scholarly journals Latent Early Acoustic Neuroma in the Internal Auditory Canal; Report of Three Cases.

1994 ◽  
Vol 87 (9) ◽  
pp. 1191-1196
Author(s):  
Naoaki YAGAGIHARA ◽  
Shingo MURAKAMI ◽  
Yasushi MATSUMOTO
Keyword(s):  
Acoustic Neuroma ◽  
Internal Auditory Canal

Arachnoid Cysts of the Posterior Fossa

1981 ◽  
Vol 89 (2) ◽  
pp. 328-332 ◽  
Author(s):  
Dennis G. Pappas ◽  
Derald E. Brackmann
Keyword(s):  
Thin Section ◽  
Posterior Fossa ◽  
Acoustic Neuroma ◽  
Diagnostic Tests ◽  
Clinical Symptoms ◽  
Internal Auditory Canal ◽  
Arachnoid Cysts ◽  
Surgical Approaches ◽  
Symptoms And Signs

The clinical symptoms and signs of four patients with arachnoid cysts in the posterior fossa are discussed. In three patients, the cyst was in the internal auditory canal; one patient had an acoustic neuroma and two large cysts in the cerebellum. Whereas the conventional diagnostic tests for acoustic neuroma cannot differentiate between neuromas and arachnoid cysts, the newer thin section body scanners can show a lesion with no enhancement in the case of the cyst. Surgical approaches for removal of this lesion must take into consideration the preservation of hearing in the involved ear.

Internal Auditory Canal Flaring in Neurofibromatosis Without Acoustic Neuroma

1980 ◽  
Vol 37 (12) ◽  
pp. 785-785 ◽  
Author(s):  
F. R. Murtagh ◽  
R. E. Boyd ◽  
T. A. Okulski
Keyword(s):  
Acoustic Neuroma ◽  
Internal Auditory Canal
Sign in / Sign up

Export Citation Format

Share Document