Fogging phenomenon

Fogging phenomenon is a term used in neurology and radiology to describe a specific appearance on brain MRI scans. This phenomenon typically occurs during the subacute phase of stroke recovery, usually between the second and fifth week after the onset of symptoms.

Overview

The fogging phenomenon is characterized by a decrease in the signal intensity of an infarct on T1- and T2-weighted images, which can make the infarct appear to vanish or "fog." This can lead to confusion in the interpretation of MRI scans, as it may appear that the patient's condition is improving when it is not.

Causes

The exact cause of the fogging phenomenon is not fully understood. However, it is believed to be related to the process of liquefactive necrosis, in which dead or dying tissue is gradually replaced by fluid. This process can alter the signal characteristics of the infarct on MRI, leading to the appearance of fogging.

Clinical significance

The fogging phenomenon can have significant implications for patient care. It can lead to underestimation of the size of a stroke, which can in turn affect decisions about treatment and prognosis. Therefore, it is important for clinicians to be aware of this phenomenon and to interpret MRI scans with caution.

See also

• Stroke
• Magnetic resonance imaging
• Liquefactive necrosis

References

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