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Incidence of late cerebrovascular events after direct bypass among children with moyamoya disease: a descriptive longitudinal study at a single center

  • Clinical Article - Vascular
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Abstract

Background

The potential for late cerebrovascular events following surgical revascularization presents a challenge in the treatment of pediatric moyamoya disease. Limited information is available on the incidence of such events after direct bypass. The objective of this descriptive study was to examine the incidence of late cerebrovascular events after direct bypass for pediatric moyamoya disease.

Methods

The study cohort comprised consecutive patients with moyamoya disease who had undergone direct bypass at less than 18 years of age in the authors’ institute between 1978 and 2003. They were prospectively followed until the end of the study period or, if applicable, the time of death.

Results

Fifty-six of 58 enrolled patients (96.6 %) were followed for a mean period of 18.1 years. Four patients experienced late cerebrovascular events, comprising one stroke and three hemorrhages, an average of 13 years after surgery, one of whom experienced a fatal second hemorrhage. The only late ischemic stroke in the cohort occurred after a severe head injury and emergent craniotomy. The incidence of late cerebrovascular events was 0.41 % per year (95 % confidence interval, 0.15–1.08); 10-year, 20-year, and 30-year cumulative incidences were 1.8 %, 7.3 %, and 13.1 %, respectively.

Conclusions

Despite the efficacy of surgical revascularization, pediatric patients remain at risk of future cerebrovascular events, especially hemorrhage, after reaching adulthood and thus require careful long-term follow-up.

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Acknowledgments

We are grateful to Dr. Takeo Nakayama, Professor at the Department of Health Informatics, Kyoto University School of Public Health, for providing statistical advice. We also thank Yuko Tanaka for her efforts at collecting patient records.

Conflicts of interest

None.

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Correspondence to Takeshi Funaki.

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Comment

The natural history of patients with moyamoya disease after revascularisation is still not well known. This manuscript deals with 56 children with a mean follow-up interval of 18.1 years; one ischemic stroke and three hemorrhages were observed. One of three hemorrhages was due to rupture of a small aneurysm at the posterior choroidal artery. These four events occurred after 13 years on average after revascuralisation surgery. The reviewer read this report with great interest as he had experience recently of an adult female patient (50 years old) who had suffered a huge hemorrhage in the right temporal lobe and right ventricle around 24 months after revascularisation surgery (bilateral STA-MCA bypass plus one STA-ACA bypass in one stage and patency of all the bypasses were confirmed with DSA). Whether revascularisation surgery prevents future hemorrhagic event or not—and, if yes, to what extent—has to be resolved. Interestingly, the hemorrhages reported in this paper and also in our patient were only in adults, occurring 18 years later and 1 year later respectively.

The mechanism of failure of prevention of hemorrhage that occurred so long after revascularisation surgery in the former case and so shortly after in the latter has also to be solved. Anyway, occurrence of hemorrhage seems to be associated with adulthood irrespective of revascularisation surgery.

By the way, fatal rerupture of the small intraventricular aneurysm of the posterior choroidal artery could have been prevented by its surgical removal, although some papers propose its shrinkage or disappearance by revascularisation.

Reference

Sadatoh A. Yonekawa Y, Morooka Y, Imakita T: A case of moyamoya disease with repeated intraventricular hemorrhage due to a ruptured pseudoaneurysm. No Shinkeigeka (1989)17:755-758 (Japanese, English abstract)

Yasuhiro Yonekawa

Zurich, Switzerland

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Funaki, T., Takahashi, J.C., Takagi, Y. et al. Incidence of late cerebrovascular events after direct bypass among children with moyamoya disease: a descriptive longitudinal study at a single center. Acta Neurochir 156, 551–559 (2014). https://doi.org/10.1007/s00701-013-1975-7

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  • DOI: https://doi.org/10.1007/s00701-013-1975-7

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