Border zone or watershed infarcts are ischemic lesions that occur in characteristic locations at the junction between two main arterial territories. These lesions constitute approximately 10% of all brain infarcts and are well described in the literature.
What is cortical border zone?
The external, cortical border zones are located between the anterior, middle, and posterior cerebral arteries and are usually wedge-shaped or ovoid (Fig 2). However, their location may vary with differences in the arterial supply.
What is a watershed area in the brain and why are they clinically important?
Watershed locations are those border-zone regions in the brain supplied by the major cerebral arteries where blood supply is decreased. Watershed strokes are a concern because they comprise approximately 10% of all ischemic stroke cases.
What is a watershed injury?
A watershed stroke describes a stroke that affects one or more of the watershed regions of the brain. The watershed regions of the brain are located at the farthest end branches of two adjacent vascular territories (areas supplied by arteries).
What type of stroke is lacunar infarct?
Lacunar stroke is a type of ischemic stroke that occurs when blood flow to one of the small arteries deep within the brain becomes blocked. According to the National Institutes of Health (NIH) , lacunar strokes represent about one-fifth of all strokes.
What is a lacunar stroke?
A stroke in a deep area of the brain (for example, a stroke in the thalamus, the basal ganglia or pons) is called a lacunar stroke. These deeper structures receive their blood flow through a unique set of arteries.
What is a cerebral infarct?
Also called ischemic stroke, a cerebral infarction occurs as a result of disrupted blood flow to the brain due to problems with the blood vessels that supply it. A lack of adequate blood supply to brain cells deprives them of oxygen and vital nutrients which can cause parts of the brain to die off.
What does a watershed infarct mean?
1 or watershed infarct, medical : a localized area of ischemic tissue death in an area of the brain situated at the farthest point of blood supply from two separate cerebral arterial systems that is caused by inadequate blood flow (as from low blood pressure, vasculitis, or blood clot obstruction)
Where do watershed infarcts occur?
Watershed cerebral infarctions, also known as border zone infarcts, occur at the border between cerebral vascular territories where the tissue is furthest from arterial supply and thus most vulnerable to reductions in perfusion.
What is watershed consciousness?
Watershed Consciousness invites site visitors to orient their sense of place to the city’s watershed. In the work, Toronto’s majestic ravine system is expressed by living wall interrupting steel sheets that interpret the urban pad. To consider this installation as a map is to confront the city’s ecological essence.
What are border zone infarcts in the brain?
Border zone or watershed infarcts are ischemic lesions that occur in characteristic locations at the junction between two main arterial territories. These lesions constitute approximately 10% of all brain infarcts and are well described in the literature. Their pathophysiology has not yet been fully elucidated,…
Are Isolated cortical border zone infarcts associated with hemodynamic compromise?
Isolated cortical border zone infarcts may be embolic in nature and are less frequently associated with hemodynamic compromise.
Are border zone infarcts associated with noncompetent circle of Willis?
Radiologic studies also support the hypothesis that border zone infarcts distal to internal carotid artery disease are more likely to occur in the presence of a noncompetent circle of Willis.
What is a watershed cerebral infarction?
Watershed cerebral infarctions , also known as border zone infarcts , occur at the border between cerebral vascular territories where the tissue is furthest from arterial supply and thus most vulnerable to reductions in perfusion. Watershed cerebral infarction accounts for 5-10% of all cerebral infarctions 8.
