Steal Phenomenon with Tonsillar Arteriovenous Malformation

Area of Science:

• Neurology
• Vascular Surgery
• Radiology

Background:

• Cranial vascular malformations, such as arteriovenous malformations (AVMs), can lead to serious cerebrovascular events.
• The steal phenomenon, a localized change in cerebral perfusion, is a known complication of AVMs.
• Transient ischemic attacks (TIAs) and strokes are potential clinical manifestations.

Purpose of the Study:

• To report the unique case of a tonsillar AVM causing a TIA.
• To illustrate the mechanism of steal phenomenon in the context of a tonsillar AVM.
• To enhance understanding of the diverse presentations of cranial AVMs.

Main Methods:

• Case report presentation.
• Review of relevant medical literature.
• Discussion of the pathophysiology of steal phenomenon in relation to the specific AVM location.

Main Results:

• The patient presented with a TIA attributed to a steal phenomenon.
• The identified cause was a tonsillar AVM, a previously unrecorded etiology for this presentation.
• Cerebral blood flow dynamics were consistent with a steal phenomenon originating from the AVM.

Conclusions:

• Tonsillar AVMs can present with TIAs due to steal phenomenon.
• This case expands the spectrum of cerebrovascular disorders associated with cranial AVMs.
• Awareness of this rare presentation is crucial for accurate diagnosis and management.