What is the meaning of a small ischemic focus in the right frontal lobe? A small ischemic focus in the right frontal lobe appears as a hypodense focus on CT. A small ischemic focus in the right frontal lobe appears on MRI as a low-density focus on the T1 image and a high-density focus on the T2 image in the case of an acute-phase ischemic focus; in the case of a chronic-phase ischemic focus in the right frontal lobe, it can be shown as an isosignal on the T1 image and a higher high-density focus on the T2 image. This indicates that there is a small infarction in the right frontal lobe, and the ischemic focus in the right frontal lobe is an imaging diagnosis. In patients with acute symptoms of weakness, numbness, or unresponsiveness of the left limb, a right frontal ischemic focus may be considered an acute cerebral infarction. If the ischemic foci in the right frontal lobe, the patient does not have any symptom, but only did a cranial CT or magnetic resonance examination, just a static imaging diagnosis, then it is not necessary to special treatment for the time being.