Comparison of contrast-enhanced T1-weighted and 3D constructive interference in steady state images for predicting outcome after hearing-preservation surgery for vestibular schwannoma.
We compared contrast-enhanced T1-weighted and 3D constructive interference in steady state (CISS) sequences for demonstrating possible prognostic factors in hearing-preservation surgery for vestibular schwannoma. We studied 22 patients with vestibular schwannomas having hearing-preservation surgery. Postoperatively six (27%) had a facial palsy and eight (36%) had hearing loss. There was a significant correlation between the size of the tumour and facial palsy (r=-0.72). Both techniques adequately demonstrated all tumours. Involvement of the fundus of the internal auditory canal (IAC) and a small distance between the lateral border of the tumour and the fundus were correlated significantly with hearing loss (r=-0.81 and -0.75, respectively). The 3D-CISS sequence, by virtue of its high contrast resolution was superior to T1-weighted images ( P<0.05) for detection of the fundal involvement. The direction of displacement of the facial nerve did not correlate with facial palsy or hearing loss. We think that 3D-CISS images better show the features influencing surgical outcome, but that contrast-enhanced T1-weighted images are required for diagnosis.
Kocaoglu
M
M
GATA Department of Radiology, 06018, Etlik, Ankara, Turkey. nbulak@gata.edu.tr
Bulakbasi
N
N
Ucoz
T
T
Ustunsoz
B
B
Pabuscu
Y
Y
Tayfun
C
C
Somuncu
I
I
D000328:Adult; D003287:Contrast Media; D007758:Ear, Inner / Q000473:pathology; D005154:Facial Nerve / Q000473:pathology; D020220:Facial Nerve Injuries / Q000517:prevention & control; D005260:Female; D019786:Gadolinium DTPA; D006311:Hearing Disorders / Q000175:diagnosis*; D006801:Humans; D021621:Imaging, Three-Dimensional; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D009361:Neoplasm Invasiveness; D009464:Neuroma, Acoustic / Q000473:pathology / Q000601:surgery*; D013506:Otologic Surgical Procedures / Q000379:methods*; D011183:Postoperative Complications; D011184:Postoperative Period; D011237:Predictive Value of Tests; D011446:Prospective Studies; D014894:Weights and Measures
D003287:Contrast Media; D019786:Gadolinium DTPA