Ischemic foci are foci appearing in cerebral tissue ischemia caused by cerebral infarction, chronic cerebral ischemia, demyelinating lesions, etc., which can often be detected by head CT or MRI.
1. Cerebral infarction: brain tissue ischemia and necrosis after the onset of cerebral infarction, ischemic foci can be detected by head CT or MRI.
2. Chronic cerebral ischemia: low signal in the long T1 image and high signal in the T2 image of magnetic resonance of the head. Head CT examination usually does not reveal obvious abnormalities.
3. Demyelinating lesions: common in subcortical arteriosclerotic encephalopathy, multiple sclerosis, etc. At the onset of head CT, ischemic foci of varying sizes can be seen next to the lateral ventricles, which appear as a low-density shadow.
Ischemic foci are diagnosed by imaging rather than clinical diagnosis, and patients should choose the treatment plan according to the etiology under the guidance of doctors.