Evaluating the role of magnetic resonance imaging scans in the surgical management of acoustic neuromas.
OBJECTIVE
To assess the reliability of magnetic resonance imaging (MRI) in predicting the size and position of an acoustic neuroma, with particular reference to the intracanalicular portion.


METHODS
Prospective study comparing the position of the tumor in the internal auditory canal on fast spin-echo MRI with the actual position measured intraoperatively.


METHODS
The study was performed in a tertiary referral neurotology center, encompassing both the public and private health care systems. Fifteen consecutive patients admitted for acoustic neuroma removal via the translabyrinthine approach were studied. The main outcome measure was tumor position in the internal auditory canal expressed in millimeters, accurate to the nearest 0.5 mm.


RESULTS
The fast spin-echo MRI was accurate within an error of 1 mm in predicting the lateral extent of the tumor in the internal auditory canal.


CONCLUSIONS
Fast spin-echo MRI can accurately predict the lateral extent of an acoustic neuroma and allow accurate planning of the surgical approach.
Hampton
S M
SM
Department of Otorhinolaryngology, Royal Victoria Hospital, Belfast, Australia.
Adler
J
J
Atlas
M D
MD
D000328:Adult; D000368:Aged; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008875:Middle Aged; D009464:Neuroma, Acoustic / Q000473:pathology* / Q000601:surgery*; D019635:Neurosurgical Procedures / Q000379:methods*; D011446:Prospective Studies; D015203:Reproducibility of Results