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Quantitative measurement of the surgical freedom for anterior communicating artery complex—a comparative study between the frontotemporal pterional and supraorbital craniotomy; a laboratory study

  • Original Article - Neurosurgical Anatomy
  • Published:
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Abstract

Objective

To quantitatively measure surgical degree of freedom (SDF) to the anterior communicating artery (AComA) complex via removal of the orbital rim. Comparisons of SDF quadrants were made between a supraorbital and standard frontotemporal pterional craniotomy according to the surgeons’ geometric microscope compass-based views.

Methods

Eleven latex-injected formalin-fixed cadaveric heads; 14 sides (eight unilateral and three bilateral) were dissected. Standard frontotemporal pterional and subsequent supraorbital craniotomy approaches were conducted in each specimen. Point “0” was allocated as a point 1 cm distal to the ipsilateral A1 and A2 junction of AComA. The tip of a 10-cm long pointer was used to locate point 0. The base of the pointer stick was maneuvered outside the craniotomy in eight compass directions, with the most peripheral points expressed as target points 1–8. The center of this octagon was attributed point C. A pyramid was established by connecting the points 0, C, and 2 neighboring target points. A frameless stereotaxic instrument was used as a three-dimensional digitizer to measure pyramid volume. Each neighboring two pyramids form a hexagonal cone and was expressed as a surgical freedom quadrant (cm3). The quadrants are depicted counterclockwise (surgeons view) as orbital-nasal, vertex-nasal, vertex-temporal, and orbital-temporal.

Results

Total SDF obtained via supraorbital and pterional approaches were 122.8 ± 109.66 and 159.94 ± 93.65, respectively (mean ± SD cm3; supraorbital < pterional by 30.2%). Supraorbital to pterional, in the orbital-nasal quadrant was 21.9 ± 35.5 and 13.04 ± 8.7, vertex-nasal 31.3 ± 28.5 and 16.7 ± 13.7, vertex-temporal 39.5 ± 42.14 and 60.4 ± 4.7, and orbital-temporal 30.14 ± 42.14 and 70.01 ± 42.14, respectively (mean ± SD cm3). In the vertex-nasal quadrant, the supraorbital approach provides a 47.3% increase in SDF compared to the standard frontotemporal pterional craniotomy approach.

Conclusion

Given that the AComA complex is located more nasally and the surgeon’s view is more vertex, we propose that a supraorbital craniotomy allows a more contralateral portion of the AComA complex to be visualized during dissection.

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Abbreviations

AComA:

Anterior communicating artery

SD:

Standard deviation

PTE:

Standard frontotemporal pterional

SDF:

Surgical degree of freedom

SUP:

Supraorbital

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Acknowledgments

The authors thank Drs. Akio Noguchi, Gregory J. Anderson, Frank H. Hsu, Sean O. McMenomey, and Johnny B. Delashaw for their contributions in the cadaver laboratory, and Shirley McCartney, Ph.D., for her editorial assistance.

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Authors and Affiliations

  1. Department of Neurosurgery, Neurological Institute, Taichung Veterans General Hospital, Taichung, Taiwan

    Cheng-Mao Cheng

  2. Department of Neurological Surgery, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan

    Cheng-Mao Cheng

  3. Department of Neurological Surgery, Oregon Health & Science University, CH8N, 3303 SW Bond Avenue, Portland, OR, 97239, USA

    Aclan Dogan

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Correspondence to Aclan Dogan.

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Cadaveric heads were provided by OHSU’s Body Donation Program with an Enrolment Form for Individual Donating to OHSU’s Whole Body Donation Program in place.

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Cheng, CM., Dogan, A. Quantitative measurement of the surgical freedom for anterior communicating artery complex—a comparative study between the frontotemporal pterional and supraorbital craniotomy; a laboratory study. Acta Neurochir 161, 2513–2519 (2019). https://doi.org/10.1007/s00701-019-04097-8

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  • DOI: https://doi.org/10.1007/s00701-019-04097-8

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