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  1. Article ; Online: Angiographic vasospasm and delayed cerebral ischemia after subarachnoid hemorrhage: Moving from theoretical to practical research pertinent to neurosurgical care.

    Raymond, J / Létourneau-Guillon, L / Darsaut, T E

    Neuro-Chirurgie

    2021  Volume 68, Issue 4, Page(s) 363–366

    Abstract: Background and purpose: Delayed cerebral ischemia (DCI) and angiographic vasospasm following subarachnoid hemorrhage (SAH) have been associated for more than 50years. We aimed to examine whether the knowledge gained by theoretical research on vasospasm ... ...

    Abstract Background and purpose: Delayed cerebral ischemia (DCI) and angiographic vasospasm following subarachnoid hemorrhage (SAH) have been associated for more than 50years. We aimed to examine whether the knowledge gained by theoretical research on vasospasm has actually translated into better patient outcomes in practice.
    Methods: This is a narrative review of the concept of vasospasm as a cause of DCI after SAH. We discuss recent studies that have assessed the accuracy and reliability of the diagnostic tests (transcranial Doppler ultrasound [TCD], CT angiography, and catheter angiography), which are used to identify SAH patients at-risk of DCI.
    Results: Both the diagnostic accuracy of TCD and the reliability of CT angiography to identify patients in severe vasospasm are poor. For the gold standard catheter angiography, the repeatability of the diagnosis of vasospasm, made by multiple raters, is only fair. Interventions on angiographic vasospasm have never been proven to improve patient outcomes. A pragmatic trial integrating the meaning of the diagnosis of vasospasm into a study protocol that assesses the value of endovascular interventions in the prevention of DCI after SAH seems to be in order. Such a trial could provide a pragmatic definition of clinically meaningful vasospasm.
    Conclusion: We must move beyond research conceived as an enterprise aiming to acquire theoretical knowledge to one where research is integrated into clinical practice to improve clinical outcomes in real time.
    MeSH term(s) Brain Ischemia/etiology ; Cerebral Angiography ; Humans ; Reproducibility of Results ; Subarachnoid Hemorrhage/complications ; Subarachnoid Hemorrhage/diagnosis ; Subarachnoid Hemorrhage/surgery ; Vasospasm, Intracranial/diagnosis ; Vasospasm, Intracranial/etiology
    Language English
    Publishing date 2021-11-26
    Publishing country France
    Document type Journal Article ; Review
    ZDB-ID 207146-0
    ISSN 1773-0619 ; 0028-3770 ; 0150-9586
    ISSN (online) 1773-0619
    ISSN 0028-3770 ; 0150-9586
    DOI 10.1016/j.neuchi.2021.10.001
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  2. Article ; Online: The role of research in my clinical practice.

    Raymond, J / Létourneau-Guillon, L / Darsaut, T E

    Neuro-Chirurgie

    2021  Volume 68, Issue 4, Page(s) 361–362

    Language English
    Publishing date 2021-09-30
    Publishing country France
    Document type Editorial
    ZDB-ID 207146-0
    ISSN 1773-0619 ; 0028-3770 ; 0150-9586
    ISSN (online) 1773-0619
    ISSN 0028-3770 ; 0150-9586
    DOI 10.1016/j.neuchi.2021.09.007
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  3. Article ; Online: Simultaneous multiple cervical vessel dissection manifested as pulsatile tinnitus.

    Nilton Nunes Mendes, George / Letourneau-Guillon, Laurent / Deschaintre, Yan

    The neuroradiology journal

    2024  , Page(s) 19714009241242663

    Abstract: A previously healthy 43-year-old woman with Wallenberg syndrome, stemming from a left vertebral artery dissection and resulting in a left lateral medulla oblongata infarct, was later diagnosed with simultaneous bi-carotid and right V3 dissection. Seven ... ...

    Abstract A previously healthy 43-year-old woman with Wallenberg syndrome, stemming from a left vertebral artery dissection and resulting in a left lateral medulla oblongata infarct, was later diagnosed with simultaneous bi-carotid and right V3 dissection. Seven days post-admission, she experienced sudden right-sided pulsatile tinnitus and exhibited a right-sided carotid murmur. High-resolution vessel wall MR imaging confirmed the new dissections. While spontaneous cervical vessel dissections involving more than two arteries are rare (less than 2% of cases), the prognosis is generally favorable. This case is noteworthy for presenting pulsatile tinnitus as a rare post-stroke dissection recurrence symptom, as documented in medical literature.
    Language English
    Publishing date 2024-03-26
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2257770-1
    ISSN 2385-1996 ; 1971-4009 ; 1120-9976
    ISSN (online) 2385-1996
    ISSN 1971-4009 ; 1120-9976
    DOI 10.1177/19714009241242663
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  4. Article ; Online: NCCT Markers of Intracerebral Hemorrhage Expansion Using Revised Criteria: An External Validation of Their Predictive Accuracy.

    Ducroux, C / Nehme, A / Rioux, B / Panzini, M-A / Fahed, R / Gioia, L C / Létourneau-Guillon, L

    AJNR. American journal of neuroradiology

    2023  Volume 44, Issue 6, Page(s) 658–664

    Abstract: Background and purpose: Several NCCT expansion markers have been proposed to improve the prediction of hematoma expansion. We retrospectively evaluated the predictive accuracy of 9 expansion markers.: Materials and methods: Patients admitted for ... ...

    Abstract Background and purpose: Several NCCT expansion markers have been proposed to improve the prediction of hematoma expansion. We retrospectively evaluated the predictive accuracy of 9 expansion markers.
    Materials and methods: Patients admitted for intracerebral hemorrhage within 24 hours of last seen well were retrospectively included from April 2016 to April 2020. The primary outcome was revised hematoma expansion, defined as any of a ≥6-mL or ≥33% increase in intracerebral hemorrhage volume, a ≥ 1-mL increase in intraventricular hemorrhage volume, or de novo intraventricular hemorrhage. We assessed the predictive accuracy of expansion markers and determined their association with revised hematoma expansion.
    Results: We included 124 patients, of whom 51 (41%) developed revised hematoma expansion. The sensitivity of each marker for the prediction of revised hematoma expansion ranged from 4% to 78%; the specificity, 37%-97%; the positive likelihood ratio, 0.41-7.16; and the negative likelihood ratio, 0.49-1.06. By means of univariable logistic regressions, 5 markers were significantly associated with revised hematoma expansion: black hole (OR = 8.66; 95% CI, 2.15-58.14;
    Conclusions: No single NCCT expansion marker had both high sensitivity and specificity for the prediction of revised hematoma expansion. Improved image-based analysis is needed to tackle limitations associated with current NCCT-based expansion markers.
    MeSH term(s) Humans ; Retrospective Studies ; Tomography, X-Ray Computed ; Cerebral Hemorrhage/diagnostic imaging ; Cerebral Hemorrhage/complications ; Biomarkers ; Hematoma/diagnostic imaging
    Chemical Substances Biomarkers
    Language English
    Publishing date 2023-05-11
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 603808-6
    ISSN 1936-959X ; 0195-6108
    ISSN (online) 1936-959X
    ISSN 0195-6108
    DOI 10.3174/ajnr.A7871
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    Zs.A 1580: Show issues Location:
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  5. Article ; Online: Measuring Interrater Reliability.

    Benomar, Anass / Zarour, Eleyine / Létourneau-Guillon, Laurent / Raymond, Jean

    Radiology

    2023  Volume 309, Issue 3, Page(s) e230492

    MeSH term(s) Humans ; Reproducibility of Results ; Observer Variation
    Language English
    Publishing date 2023-12-12
    Publishing country United States
    Document type Editorial
    ZDB-ID 80324-8
    ISSN 1527-1315 ; 0033-8419
    ISSN (online) 1527-1315
    ISSN 0033-8419
    DOI 10.1148/radiol.230492
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  6. Article ; Online: Imaging of Vasculitis Associated with Systemic Disease.

    Padilha, Igor Gomes / Nehme, Ahmad / de Boysson, Hubert / Létourneau-Guillon, Laurent

    Neuroimaging clinics of North America

    2023  Volume 34, Issue 1, Page(s) 81–92

    Abstract: Vasculitides are characterized by inflammation of the vessel wall, with their categorization relying on clinical and paraclinical manifestations, vessel type, size, distribution, histological attributes, and associated conditions. This review delves into ...

    Abstract Vasculitides are characterized by inflammation of the vessel wall, with their categorization relying on clinical and paraclinical manifestations, vessel type, size, distribution, histological attributes, and associated conditions. This review delves into the salient neuroimaging hallmarks of central nervous system vasculitis associated with the most prevalent systemic diseases and highlightings potential pitfalls and diagnostic confounders.
    MeSH term(s) Humans ; Sjogren's Syndrome ; Vasculitis/complications ; Vasculitis/diagnostic imaging
    Language English
    Publishing date 2023-10-09
    Publishing country United States
    Document type Journal Article ; Review
    ZDB-ID 1314594-0
    ISSN 1557-9867 ; 1052-5149
    ISSN (online) 1557-9867
    ISSN 1052-5149
    DOI 10.1016/j.nic.2023.07.010
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  7. Article: Cerebral Air Embolism Following Catheter Ablation for Atrial Fibrillation.

    Millán Sandoval, Juan Pablo / Dufort, Gabrielle / Letourneau-Guillon, Laurent / Liberman, Moishe / Odier, Céline

    The Canadian journal of neurological sciences. Le journal canadien des sciences neurologiques

    2023  , Page(s) 1–2

    Language English
    Publishing date 2023-05-09
    Publishing country England
    Document type Journal Article
    ZDB-ID 197622-9
    ISSN 0317-1671
    ISSN 0317-1671
    DOI 10.1017/cjn.2023.55
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    Zs.A 1203: Show issues Location:
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  8. Article ; Online: Facial palsy after temporal lobectomy for epilepsy: illustrative cases.

    Lemoine, Émile / Obaid, Sami / Létourneau-Guillon, Laurent / Bouthillier, Alain

    Journal of neurosurgery. Case lessons

    2021  Volume 1, Issue 17, Page(s) CASE2138

    Abstract: Background: Facial palsy is a rare, unexpected complication of temporal lobectomy (TL) for intractable epilepsy. Even without direct manipulation, the facial nerve fibers may be at risk of injury during supratentorial surgery, including TL.: ... ...

    Abstract Background: Facial palsy is a rare, unexpected complication of temporal lobectomy (TL) for intractable epilepsy. Even without direct manipulation, the facial nerve fibers may be at risk of injury during supratentorial surgery, including TL.
    Observations: The authors presented two cases of facial palsy after unremarkable TL. In the first case, the palsy appeared in a delayed fashion and completely resolved within weeks. In the second case, facial nerve dysfunction was observed immediately after surgery, followed by progressive recovery over 2 years. The second patient had a dehiscence of the roof of the petrous bone overlying the geniculate ganglion, which put the facial nerve at risk of bipolar coagulation thermal injury.
    Lessons: Two major mechanisms could explain the loss of facial nerve function after TL: surgery-related indirect inflammation of the nerve resulting in herpesvirus reactivation and delayed dysfunction (Bell's palsy) or indirect thermal damage to the geniculate ganglion through a dehiscent petrous roof.
    Language English
    Publishing date 2021-04-26
    Publishing country United States
    Document type Case Reports
    ISSN 2694-1902
    ISSN (online) 2694-1902
    DOI 10.3171/CASE2138
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  9. Article ; Online: In Reply to the Letter to the Editor Regarding "Repeated Retching and Vomiting in the Pathophysiology of Isolated Spinal Aneurysms".

    Bojanowski, Michel W / Létourneau-Guillon, Laurent / Bergeron, David / Chaalala, Chiraz

    World neurosurgery

    2021  Volume 151, Page(s) 334

    MeSH term(s) Aneurysm ; Humans ; Spine ; Vomiting
    Language English
    Publishing date 2021-07-09
    Publishing country United States
    Document type Letter ; Comment
    ZDB-ID 2534351-8
    ISSN 1878-8769 ; 1878-8750
    ISSN (online) 1878-8769
    ISSN 1878-8750
    DOI 10.1016/j.wneu.2021.04.058
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  10. Article ; Online: Papilledema: A Review of the Pathophysiology, Imaging Findings, and Mimics.

    Guarnizo, Angela / Albreiki, Danah / Cruz, Juan Pablo / Létourneau-Guillon, Laurent / Iancu, Dana / Torres, Carlos

    Canadian Association of Radiologists journal = Journal l'Association canadienne des radiologistes

    2022  Volume 73, Issue 3, Page(s) 557–567

    Abstract: Increased intracranial pressure is the most common cause of papilledema. Multiple etiologies such as cerebral edema, hydrocephalus, space occupying lesions, infection, and idiopathic intracranial hypertension among others should be considered. Imaging ... ...

    Abstract Increased intracranial pressure is the most common cause of papilledema. Multiple etiologies such as cerebral edema, hydrocephalus, space occupying lesions, infection, and idiopathic intracranial hypertension among others should be considered. Imaging plays a critical role in the detection of pathologies that can cause papilledema. MRI with contrast and CE-MRV, in particular, are key for the diagnosis of idiopathic intracranial hypertension. This review will focus in common and infrequent causes of papilledema, the role of imaging in patients with papilledema as well as its potential mimickers.
    MeSH term(s) Diagnosis, Differential ; Humans ; Magnetic Resonance Imaging/adverse effects ; Papilledema/diagnostic imaging ; Papilledema/etiology ; Pseudotumor Cerebri/complications ; Pseudotumor Cerebri/diagnostic imaging
    Language English
    Publishing date 2022-01-19
    Publishing country United States
    Document type Journal Article ; Review
    ZDB-ID 418190-6
    ISSN 1488-2361 ; 0846-5371 ; 0008-2902
    ISSN (online) 1488-2361
    ISSN 0846-5371 ; 0008-2902
    DOI 10.1177/08465371211061660
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