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Subarachnoid hemorrhage due to flow-related dissection of the posterior inferior cerebellar artery associated with a distal arteriovenous malformation


Akeret, Kevin; Germans, Menno; Sun, Wenhua; Kulcsar, Zsolt; Regli, Luca (2019). Subarachnoid hemorrhage due to flow-related dissection of the posterior inferior cerebellar artery associated with a distal arteriovenous malformation. World Neurosurgery, 125:44-48.

Abstract

BACKGROUND

and Importance: Cerebral arteriovenous malformations (CAVM) are characterized by altered hemodynamics and associated with angioanatomical changes, such as aneuryms. We encountered a patient with a CAVM-associated dissection of the medial trunk of the posterior inferior cerebellar artery (PICA) instead of an aneurysm.

CLINICAL PRESENTATION

We report the case of a 56-year old male patient with spontaneous subarachnoid hemorrhage within the cisterna magna and fourth ventricle. Digital subtraction angiography (DSA) revealed a cerebellar AVM located within the inferior semilunar lobule, however anatomically not matching the bleeding pattern. The left PICA, serving as primary feeding artery, showed a dissection of the proximal portion of the medial trunk with precise anatomical association to the blood in the telovelotonsillar space. CAVM induced hyperdynamic flow through the feeding vessel is the most plausible pathophysiological explanation for the dissection. Complete microsurgical resection of the CAVM was performed and three months follow-up DSA showed complete regression of the dissection, disappearance of the irregularities and significant caliber reductions of the medial PICA trunk.

CONCLUSION

This is the first report of a hyperdynamic flow-related dissection of a CAVM-associated feeding vessel. Microsurgical resection of the CAVM allowed for spontaneous resolution of the dissected area by restoration of normal rheodynamics.

Abstract

BACKGROUND

and Importance: Cerebral arteriovenous malformations (CAVM) are characterized by altered hemodynamics and associated with angioanatomical changes, such as aneuryms. We encountered a patient with a CAVM-associated dissection of the medial trunk of the posterior inferior cerebellar artery (PICA) instead of an aneurysm.

CLINICAL PRESENTATION

We report the case of a 56-year old male patient with spontaneous subarachnoid hemorrhage within the cisterna magna and fourth ventricle. Digital subtraction angiography (DSA) revealed a cerebellar AVM located within the inferior semilunar lobule, however anatomically not matching the bleeding pattern. The left PICA, serving as primary feeding artery, showed a dissection of the proximal portion of the medial trunk with precise anatomical association to the blood in the telovelotonsillar space. CAVM induced hyperdynamic flow through the feeding vessel is the most plausible pathophysiological explanation for the dissection. Complete microsurgical resection of the CAVM was performed and three months follow-up DSA showed complete regression of the dissection, disappearance of the irregularities and significant caliber reductions of the medial PICA trunk.

CONCLUSION

This is the first report of a hyperdynamic flow-related dissection of a CAVM-associated feeding vessel. Microsurgical resection of the CAVM allowed for spontaneous resolution of the dissected area by restoration of normal rheodynamics.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:04 Faculty of Medicine > University Hospital Zurich > Clinic for Neuroradiology
Dewey Decimal Classification:610 Medicine & health
Language:English
Date:1 May 2019
Deposited On:26 Jul 2019 12:39
Last Modified:25 Sep 2019 00:38
Publisher:Elsevier
ISSN:1878-8750
OA Status:Closed
Publisher DOI:https://doi.org/10.1016/j.wneu.2019.01.148
PubMed ID:30721771

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