Lacunar infarct

Lacunar stroke
Arteries beneath brain
Classification and external resources
Specialty	Neurology
ICD-10	G46.5-G46.7
ICD-9-CM	434.91
DiseasesDB	31186
eMedicine	pmr/63
MeSH	D020520
[]

Lacunar stroke or lacunar infarct (LACI) is the most common type of stroke, and results from the occlusion of small penetrating arteries that provide blood to the brain's deep structures. Patients who present with symptoms of a lacunar stroke, but who have not yet had diagnostic imaging performed, may be described as suffering from lacunar stroke syndrome (LACS).

Much of the current knowledge of lacunar strokes comes from C. Miller Fisher's cadaver dissections of post-mortem stroke patients. He observed "lacunae" (empty spaces) in the deep brain structures after occlusion of 200–800 μm penetrating arteries and connected them with five classic syndromes. These syndromes are still noted today, though lacunar infarcts are diagnosed based on clinical judgment and radiologic imaging.

Each of the 5 classical lacunar syndromes has a relatively distinct symptom complex. Symptoms may occur suddenly, progressively, or in a fluctuating (e.g., the capsular warning syndrome) manner. Occasionally, cortical infarcts and intracranial hemorrhages can mimic lacunar infarcts, but true cortical infarct signs (aphasia, visuospatial neglect, gaze deviation, and visual field defects) are always absent. The 5 classic syndromes are as follows:

A silent lacunar infarction (SLI) is one type of silent stroke which usually shows no identifiable outward symptoms thus the term "silent". Individuals who suffer a SLI are often completely unaware they have suffered a stroke. This type of stroke often causes lesions in the surrounding brain tissue that are visibly detected via neuroimaging techniques such as MRI and computerized axial tomography (CT scan). Silent strokes, including silent lacunar infarctions, have been shown to be much more common than previously thought, with an estimated prevalence rate of eleven million per year in the United States. Approximately 10% of these silent strokes are silent lacunar infarctions. While dubbed "silent" due to the immediate lack of classic stroke symptoms, SLIs can cause damage to the surrounding brain tissue (lesions) and can affect various aspects of a persons mood, personality, and cognitive functioning. A SLI or any type of silent stroke places an individual at greater risk for future major stroke.

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Wikipedia