Abstract
Purpose
Tectum mesencephali arteriovenous malformations (TM-AVMs) are rare lesions deeply located close to eloquent structures making them challenging to treat. We aimed to present clinical presentation, angiographic features and treatment strategies of TM-AVMs through a single center retrospective case series.
Methods
A TM-AVMs is defined as a nidus located in the parenchyma or on the pia mater of the posterior midbrain. Records of consecutive patients admitted with TM-AVMs over a 21-year period were retrospectively analyzed. Vascular anatomy of the region is also reviewed.
Results
In this study 13 patients (1.63% of the complete cohort; 10 males), mean age 48 years, were included. All patients presented with intracranial hemorrhage and two patients (15%) died after an early recurrent bleeding. Mean size of the TM-AVMs was 10.1 ± 5 mm. Multiple arterial feeders were noted in every cases. Of the patients 11 underwent an exclusion treatment, 8 via embolization (6 via arterial access and 2 via venous access) and 4 via stereotactic radiosurgery (SRS) (1 patient received both). Overall success treatment rate was 7/11 patients (64% overall; 63% in the embolization group, 25% in the SRS group). Two hemorrhagic events led to a worsened outcome, one during embolization and one several years after SRS. All other patients remained clinically stable or improved.
Conclusion
The TM-AVMs are rare but stereotypic lesions found in a hemorrhagic context. Multiple arterial feeders are always present. Endovascular treatment seems to be an effective technique with relatively low morbidity; SRS had a low success rate but was only use in a limited number of patients.
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Abbreviations
- BV:
-
Basal vein
- CoA:
-
Collicular artery
- ICH:
-
Intracerebral hemorrhage
- IVH:
-
Intraventricular hemorrhage
- LMV:
-
Lateral mesencephalic vein
- MPChA:
-
Medial posterior choroidal artery
- mRS:
-
Modified Rankin scale
- MSCA:
-
Medial superior cerebellar artery
- PcCV:
-
Precentral cerebellar vein
- PMV:
-
Posterior mesencephalic vein
- SPV:
-
Superior petrosal vein
- SRS:
-
Stereotactic radiosurgery
- TM:
-
Tectum mesencephali
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Acknowledgements
We thank Mrs. Diane Rottner for the anatomical drawings (dianerottner.com).
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This research received no specific grant from any funding agency in the public, commercial or not-for-profit sectors.
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JC, MD, SL, NAS, CAV, ES and FC acquired the data. JC, ES and FC developed the project, analyzed the data, and drafted the manuscript. JC, DH, ES, KP and FC revised the anatomical description. All authors critically revised the paper for important intellectual content and provided final approval of the version published. All authors agree to be accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved.
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N.-A. Sourour is consultant for Medtronic, Balt Extrusion, Microvention. F. Clarençon reports conflict of interest with Medtronic, Guerbet, Balt Extrusion, Penumbra (paid lectures; unrelated to the study), Codman Neurovascular and Microvention (core lab; unrelated to the study). J. Cortese, M. Delaitre, E. Shotar, S. Lenck, K. Premat, D. Hasboun, A. Talbi, T. Grand, A.-L. Boch, B. Mathon, C.-A. Valery and M. Drir declare that they have no competing interests.
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Cortese, J., Delaitre, M., Shotar, E. et al. Clinical Characteristics, Angioarchitecture and Management of Tectum Mesencephali Arteriovenous Malformations. Clin Neuroradiol 32, 445–454 (2022). https://doi.org/10.1007/s00062-021-01047-9
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DOI: https://doi.org/10.1007/s00062-021-01047-9