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[False-negative native CT findings in the development of cerebral ischemia]
1Neurologická klinika I. LF UK a VFN, Praha.
Background:
The "fogging effect" in the native CT picture of the brain masks in case of a cerebrovascular attack the pathological finding of hypodensity by creating a neovascular net necessary for the clearing activity of macrophages.
Methods And Results:
The "fogging effect" was diagnosed on CT and monitored as a transient finding in a patient after a cerebrovascular attack. The submitted paper analyzes in detail and explains the dynamically developing clinical symptomatology of the patient.
Conclusions:
The "fogging effect" can be the source of erroneous clinical interpretation of a CT finding. It is important to know about its existence, and in case of diagnostic doubts, consider the i.v. administration of a contrast substance even though the perfusion may temporarily deteriorate. Visualization of an ischaemic focus by contrast provides unequivocal evidence of the extent and site of malacia.