Commonest cause of cerebral infarction is
Refer Robbins page no 1263 Infarction is tissue death (necrosis) due to inadequate blood supply to the affected area. It may be caused by aery blockages, rupture, mechanical compression, or vasoconstriction. The resulting lesion is referred to as an infarct (from the Latin infarctus, "stuffed into").
Aerial thrombosis
Aeritis
Venous thrombosis
Embolism
Nervous system