Br J Ophthalmol 2000;84:884-889
( August )
Anatomy of optic nerve radiations as assessed by static perimetry
and MRI after tailored temporal lobectomy
P Krolak-Salmona, M Guenotb, C Tiliketa, J Isnardc, M Sindoub, F Mauguierec, A Vighettoa
a Department of
Neuro-ophthalmology, P Wertheimer Neurological Hospital, Lyons, France, b Department of Neuro-surgery, c Department of Epileptology
Correspondence to: P
Krolak-Salmon, Service de Neuro-ophtalmologie, Hopital Neurologique et
Neuro-chirurgical P Wertheimer, 59 Boulevard Pinel, 69394 Lyon cedex
03, France
pkrolak{at}club-internet.fr
Accepted for publication 25 February 2000
AIMS To determine the
course of optic nerve radiations in the temporal lobe, especially their
retinotopic organisation and the anterior limit of the Meyer's loop.
METHODS18 adult
patients who had undergone a tailored temporal lobectomy for epilepsy
were included in this study between 1994 and 1998. The rostrocaudal
extent of the lateral temporal lobe resection assessed intraoperatively
by the surgeon and by postoperative MRI was compared with the
postoperative visual fields determined by automated static perimetry (ASP).
RESULTS15 patients
(83%) presented a postoperative visual field deficit (VFD) confined to
the superior homonymous field contralateral to the side of the
resection. All degrees from a minimal upper field loss to a complete
quadrantanopia were observed. The VFDs were somewhat stereotyped,
predominating along the vertical meridian. The smallest anteroposterior
resection resulting in a VFD was limited to 20 mm from the tip of the
temporal lobe. A relation was observed between the extent of the
lateral resection in front of the second and third convolutions and the
occurrence and extent of postoperative VFDs. No patient reported
persisting subjective visual impairment.
CONCLUSIONThe high
frequency of postoperative VFDs appears to be due to the greater
sensitivity of ASP. The characteristics of the stereotyped VFDs allow
new conclusions about the course and retinotopy of optic nerve
radiations. The anterior limit of Meyer's loop is likely to be located
more rostrally than previously believed.
© 2000 by British Journal of Ophthalmology
This article has been cited by other articles:
|
|
|
|
 
T. Taoka, M. Sakamoto, H. Nakagawa, H. Nakase, S. Iwasaki, K. Takayama, K. Taoka, T. Hoshida, T. Sakaki, and K. Kichikawa
Diffusion Tensor Tractography of the Meyer Loop in Cases of Temporal Lobe Resection for Temporal Lobe Epilepsy: Correlation between Postsurgical Visual Field Defect and Anterior Limit of Meyer Loop on Tractography
AJNR Am. J. Neuroradiol.,
August 1, 2008;
29(7):
1329 - 1334.
[Abstract]
[Full Text]
[PDF]
|
|
|
|
|
|
|
J. J. S. Barton, R. Hefter, B. Chang, D. Schomer, and F. Drislane
The field defects of anterior temporal lobectomy: a quantitative reassessment of Meyer's loop
Brain,
September 1, 2005;
128(9):
2123 - 2133.
[Abstract]
[Full Text]
[PDF]
|
|
|
|
|
|
|
H.W.R. Powell, G. J.M. Parker, D. C. Alexander, M. R. Symms, P. A. Boulby, C. A.M. Wheeler-Kingshott, G. J. Barker, M. J. Koepp, and J. S. Duncan
MR tractography predicts visual field defects following temporal lobe resection
Neurology,
August 23, 2005;
65(4):
596 - 599.
[Abstract]
[Full Text]
[PDF]
|
|
|
|
|
|
|
T. Taoka, M. Sakamoto, S. Iwasaki, H. Nakagawa, A. Fukusumi, S. Hirohashi, K. Taoka, K. Kichikawa, T. Hoshida, and T. Sakaki
Diffusion Tensor Imaging in Cases with Visual Field Defect after Anterior Temporal Lobectomy
AJNR Am. J. Neuroradiol.,
April 1, 2005;
26(4):
797 - 803.
[Abstract]
[Full Text]
[PDF]
|
|
|
|
|
