Frontal aslant tract in the non-dominant hemisphere: A systematic review of anatomy, functions, and surgical applications

Gallet, Clémentine; Clavreul, Anne; Bernard, Florian; Meneï, Philippe; Lemée, Jean‐Michel

doi:10.3389/fnana.2022.1025866

Cited by 6 publications

(5 citation statements)

References 93 publications

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“…Axonal stimulation of the SMA, frontal aslant tract (FAT), and fronto-striatal tracts in awake patients performing continuous movements can result in disturbances of motor initiation and control, ranging from complete arrest to an involuntary acceleration of movement. While postoperative SMA syndrome is generally considered transient, Briggs et al (2021) reported that neglecting the preservation of FAT fibers (originating from the supplementary motor area) can lead to permanent deficits in 13% of patients [ 43 ]. Furthermore, unilateral subcortical direct electrical stimulation of the right hemisphere can not only disrupt left movement but also affect the movement of both hands during a bimanual coordination task [ 44 ].…”

Section: Resultsmentioning

confidence: 99%

Awake Craniotomy for Gliomas in the Non-Dominant Right Hemisphere: A Comprehensive Review

Mamadaliev,

Saito,

Motomura

et al. 2024

Cancers

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Awake surgery has become a standard practice for managing diffuse low-grade gliomas (LGGs), particularly in eloquent brain areas, and is established as a gold standard technique for left-dominant-hemisphere tumors. However, the intraoperative monitoring of functions in the right non-dominant hemisphere (RndH) is often neglected, highlighting the need for a better understanding of neurocognitive testing for complex functions in the right hemisphere. This article aims to comprehensively review the current literature on the benefits of awake craniotomy in gliomas of the non-dominant right hemisphere. A systematic review was conducted using the PubMed and ScienceDirect databases with keywords such as “right hemisphere”, “awake surgery”, “direct electrical brain stimulation and mapping”, and “glioma”. The search focused on anatomical and surgical aspects, including indications, tools, and techniques of awake surgery in right cerebral hemisphere gliomas. The literature search identified 74 sources, including original articles, books, monographs, and review articles. Two papers reported large series of language assessment cases in 246 patients undergoing awake surgery with detailed neurological semiology and mapping techniques, while the remaining studies were predominantly neuroradiological and neuroimaging in nature. Awake craniotomy for non-dominant-hemisphere gliomas is an essential tool. The term “non-dominant” should be revised, as this hemisphere contributes significantly to essential cognitive functions in the human brain.

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Section: Resultsmentioning

confidence: 99%

Awake Craniotomy for Gliomas in the Non-Dominant Right Hemisphere: A Comprehensive Review

Mamadaliev,

Saito,

Motomura

et al. 2024

Cancers

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“…For example, when the right FAT was transiently disrupted by DES, the patient's gaze shifted from one face to another, unable to identify which avatar was trying to make eye contact, or remained fixed on the first avatar encountered regardless of emotion or intent to communicate. The involvement of the FAT in the expression and recognition of communicative intentions may account for this behavior [61][62][63]. The right FAT has a putative role in the support of executive function, through inhibitory control and conflict monitoring for action, which may provide an alternative explanation [64,65].…”

Section: Discussionmentioning

confidence: 99%

Virtual Reality-Assisted Awake Craniotomy: A Retrospective Study

Bernard

Clavreul

Casanova

et al. 2023

Cancers

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Background: Awake craniotomy (AC) with brain mapping for language and motor functions is often performed for tumors within or adjacent to eloquent brain regions. However, other important functions, such as vision and visuospatial and social cognition, are less frequently mapped, at least partly due to the difficulty of defining tasks suitable for the constrained AC environment. Objective: The aim of this retrospective study was to demonstrate, through illustrative cases, how a virtual reality headset (VRH) equipped with eye tracking can open up new possibilities for the mapping of language, the visual field and complex cognitive functions in the operating room. Methods: Virtual reality (VR) tasks performed during 69 ACs were evaluated retrospectively. Three types of VR tasks were used: VR-DO80 for language evaluation, VR-Esterman for visual field assessment and VR-TANGO for the evaluation of visuospatial and social functions. Results: Surgery was performed on the right hemisphere for 29 of the 69 ACs performed (42.0%). One AC (1.5%) was performed with all three VR tasks, 14 ACs (20.3%) were performed with two VR tasks and 54 ACs (78.3%) were performed with one VR task. The median duration of VRH use per patient was 15.5 min. None of the patients had “VR sickness”. Only transitory focal seizures of no consequence and unrelated to VRH use were observed during AC. Patients were able to perform all VR tasks. Eye tracking was functional, enabling the medical team to analyze the patients’ attention and exploration of the visual field of the VRH directly. Conclusions: This preliminary experiment shows that VR approaches can provide neurosurgeons with a way of investigating various functions, including social cognition during AC. Given the rapid advances in VR technology and the unbelievable sense of immersion provided by the most recent devices, there is a need for ongoing reflection and discussions of the ethical and methodological considerations associated with the use of these advanced technologies in AC and brain mapping procedures.

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“…These "blades" used for delineation of white matter bundles entering/exiting gyri, were identical to the "gyral window" defined by Prothero and Sundsten [28]. However, it was suggested [29] that Aron et al [30] first described the white-matter pathway connecting the inferior frontal cortex with the medial superior frontal cortex, as a part of the circuit pathway between the IFG, presupplementary motor area and subthalamic nucleus. Later, this pathway was named the frontal aslant tract (FAT) by Catani et al [23], due to its oblique direction within the frontal lobe.…”

Section: The Frontal Aslant Tract -Fat (Fasciculus Frontalis Obliquus...mentioning

confidence: 98%

“…Some findings indicate that degeneration of the FAT underlies verbal fluency deficits in primary progressive aphasia [16]. In other review of the literature about the FAT in the non-dominant hemisphere (usually the right) [29], it has been found that despite the structural symmetry between the right and left FAT, these two tracts seem to display functional asymmetry. These facts about structural symmetry of FAT are actually expected according to our findings of smaller anatomical asymmetry of frontal operculum [33] or of frontal lobe [34] using the "essential gyral line".…”

Section: The Frontal Aslant Tract -Fat (Fasciculus Frontalis Obliquus...mentioning

confidence: 99%

Contribution of tractography to neuroanatomical terminology - short association tracts of the frontal lobe

Malobabić,

Spasojević

2024

Biomedicinska istraž.

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<p style="text-align: justify;">Enormous development of neuroimaging technologies, and subsequently of research methods, opened new era of in vivo research of the white matter anatomy. This review analyzes recent connectomics and imaging data about short association fibers of the frontal lobe, and relates it to current status and to further development of anatomical terminology. In some recent terminologies, such as in Neuroanatomical Terminology, or in Terminology of German Anatomical Society, under the section Fibrae associationis lobares Fasciculus frontalis obliquus, Fasciculus frontalis orbitopolaris and Fasciculus frontomarginalis have been listed. Also, in this review anatomy of the potential candidates for adding into new terminologies is described, such as Fronto-parietal U-tracts, Fronto-insular tracts, and Frontal longitudinal fasciculus system. Suggestions considered in this review are related to our research of human brain morphology in order to overcome the lack of postmortem brain specimens, to contribute to the linking of different data, and to enable better morphological correlations. &nbsp;</p>

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Frontal aslant tract in the non-dominant hemisphere: A systematic review of anatomy, functions, and surgical applications

Cited by 6 publications

References 93 publications

Awake Craniotomy for Gliomas in the Non-Dominant Right Hemisphere: A Comprehensive Review

Awake Craniotomy for Gliomas in the Non-Dominant Right Hemisphere: A Comprehensive Review

Virtual Reality-Assisted Awake Craniotomy: A Retrospective Study

Contribution of tractography to neuroanatomical terminology - short association tracts of the frontal lobe

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