Prevention of postoperative visual field defect after the occipital transtentorial approach: Anatomical study

Satoshi Matsuo, Serhat Baydin, Abuzer Güngör, Erik H. Middlebrooks, Noritaka Komune, Koji Iihara, Albert L. Rhoton

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

OBJECTIVE A postoperative visual field defect resulting from damage to the occipital lobe during surgery is a unique complication of the occipital transtentorial approach. Though the association between patient position and this complication is well investigated, preventing the complication remains a challenge. To define the area of the occipital lobe in which retraction is least harmful, the surface anatomy of the brain, course of the optic radiations, and microsurgical anatomy of the occipital transtentorial approach were examined. METHODS Twelve formalin-fixed cadaveric adult heads were examined with the aid of a surgical microscope and 0 ° and 45 °endoscopes. The optic radiations were examined by fiber dissection and MR tractography techniques. RESULTS The arterial and venous relationships of the lateral, medial, and inferior surfaces of the occipital lobe were defined anatomically. The full course of the optic radiations was displayed via both fiber dissection and MR tractography. Although the stems of the optic radiations as exposed by both techniques are similar, the terminations of the fibers are slightly different. The occipital transtentorial approach provides access for the removal of lesions involving the splenium, pineal gland, collicular plate, cerebellomesencephalic fissure, and anterosuperior part of the cerebellum. An angled endoscope can aid in exposing the superior medullary velum and superior cerebellar peduncles. CONCLUSIONS Anatomical findings suggest that retracting the inferior surface of the occipital lobe may avoid direct damage and perfusion deficiency around the calcarine cortex and optic radiations near their termination. An accurate understanding of the course of the optic radiations and vascular relationships around the occipital lobe and careful retraction of the inferior surface of the occipital lobe may reduce the incidence of postoperative visual field defect.

Original languageEnglish
Pages (from-to)188-197
Number of pages10
JournalJournal of Neurosurgery
Volume129
Issue number1
DOIs
Publication statusPublished - Jul 1 2018

Fingerprint

Occipital Lobe
Visual Fields
Radiation
Endoscopes
Dissection
Anatomy
Pineal Gland
Cerebellum
Formaldehyde
Blood Vessels
Perfusion
Head
Incidence
Brain

All Science Journal Classification (ASJC) codes

  • Surgery
  • Clinical Neurology

Cite this

Prevention of postoperative visual field defect after the occipital transtentorial approach : Anatomical study. / Matsuo, Satoshi; Baydin, Serhat; Güngör, Abuzer; Middlebrooks, Erik H.; Komune, Noritaka; Iihara, Koji; Rhoton, Albert L.

In: Journal of Neurosurgery, Vol. 129, No. 1, 01.07.2018, p. 188-197.

Research output: Contribution to journalArticle

Matsuo, Satoshi ; Baydin, Serhat ; Güngör, Abuzer ; Middlebrooks, Erik H. ; Komune, Noritaka ; Iihara, Koji ; Rhoton, Albert L. / Prevention of postoperative visual field defect after the occipital transtentorial approach : Anatomical study. In: Journal of Neurosurgery. 2018 ; Vol. 129, No. 1. pp. 188-197.
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abstract = "OBJECTIVE A postoperative visual field defect resulting from damage to the occipital lobe during surgery is a unique complication of the occipital transtentorial approach. Though the association between patient position and this complication is well investigated, preventing the complication remains a challenge. To define the area of the occipital lobe in which retraction is least harmful, the surface anatomy of the brain, course of the optic radiations, and microsurgical anatomy of the occipital transtentorial approach were examined. METHODS Twelve formalin-fixed cadaveric adult heads were examined with the aid of a surgical microscope and 0 ° and 45 °endoscopes. The optic radiations were examined by fiber dissection and MR tractography techniques. RESULTS The arterial and venous relationships of the lateral, medial, and inferior surfaces of the occipital lobe were defined anatomically. The full course of the optic radiations was displayed via both fiber dissection and MR tractography. Although the stems of the optic radiations as exposed by both techniques are similar, the terminations of the fibers are slightly different. The occipital transtentorial approach provides access for the removal of lesions involving the splenium, pineal gland, collicular plate, cerebellomesencephalic fissure, and anterosuperior part of the cerebellum. An angled endoscope can aid in exposing the superior medullary velum and superior cerebellar peduncles. CONCLUSIONS Anatomical findings suggest that retracting the inferior surface of the occipital lobe may avoid direct damage and perfusion deficiency around the calcarine cortex and optic radiations near their termination. An accurate understanding of the course of the optic radiations and vascular relationships around the occipital lobe and careful retraction of the inferior surface of the occipital lobe may reduce the incidence of postoperative visual field defect.",
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