Abducens nerve palsy in a congenital anomalous neurovascular development of the sixth cranial nerve and anterior inferior cerebellar artery: A case report

Canovetti, Silvia; Pasquali, Livia; Lucchi, Giacomo; Donatelli, Graziella; Cosottini, Mirco

doi:10.1016/j.radcr.2022.08.001

Cited by 1 publication

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References 7 publications

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“…Abducens nerve duplication is an uncommon anatomical finding predominantly reported in cadaveric specimens, with a frequency of 5 to 28.6%, and rarely reported intraoperatively. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] The abducens nerve courses from the pontomedullary sulcus to the lateral rectus muscle and is divided into five segments: three located intracranially (cisternal, transdural, and cavernous segments) and two orbitally (superior orbital fissure and intraconal segments). 8,17 The abducens nerve has multiple fixation points in the subarachnoid course and complex topographic relationships.…”

Section: Introductionmentioning

confidence: 99%

Abducens Nerve Duplication: Novel Intraoperative and Radiographic Observation of a Rare Anatomical Variant

Graffeo,

Scherschinski,

Benet

et al. 2024

J Neurol Surg B Skull Base

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Objectives The abducens nerve has a long, serpentine subarachnoid course with complex topographical relationships, rendering abducens nerve palsy the most common ocular motor cranial nerve palsy in adults and second most common in pediatric patients, with anatomical variants reported in the literature. Preoperative awareness of abducens nerve variant anatomy may help prevent inadvertent intraoperative injury. Design This study is a case report with a review of the abducens nerve anatomy and variants. Setting The study setting included outpatient, inpatient, and operating room in the neurosurgery department of a quaternary referral center. Participants The study included a woman in her early 30s with a diagnosis of petrous meningioma. Main Outcome Measures In vivo documentation of a type 3 abducens nerve duplication was carried out. Results A left extended retrosigmoid craniotomy was recommended for the petroclival meningioma resection. Intraoperatively, a complete duplication of the left abducens cisternal segment was encountered and photographed. The left unilateral abducens nerve duplication was confirmed with postoperative volumetric magnetic resonance imaging using the FIESTA (fast imaging employing steady-state acquisition) sequence, revealing the union of the duplicated cisternal abducens nerves into a single trunk from Dorello's canal distally. Conclusions Abducens nerve variants are uncommon, and although reported in the setting of cadaveric dissection, in vivo documentation of them is limited. This case report of an in vivo type 3 abducens nerve duplication with intraoperative photographic and radiographic images highlights the need for clinical awareness to avoid inadvertent intraoperative injury.

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