Fogging Effect in Strokes: Are We Aware of It?

Fogging effect is a transitory phenomenon of concealed cerebral infarction on computed tomography (CT). This effect is generally noticed within 2-3 weeks from the stroke onset.

CT scan is the initial diagnostic imaging tool to demonstrate Ischemic strokes and ruling out/in hemorrhage.

They usually demonstrate Hypo density on non-contrast CT scan. Iso-dense infarcts are misleading for radiologists and physicians as they might be interpreted as normal in spite of a clinically suspected stroke. Fogging reported to be seen in about 50% of the ischemic strokes.

Knowledge of this effect is crucial to avoid misinterpretation or underestimation of this important finding and my guide further management especially if anticoagulants are being considered.


Huda Al-Jadiry and Ahmed Q Hasan

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