What is an infarct?

Focus of ischemic necrosis due to abrupt interruption of arterial blood supply w/out collaterals, often brutal and total. Size should exceed 1.5cm (brain) or 2cm (myocardium), most common in end-stage arterial vasculature organs. Comes in morphological varieties (white/pale pure ischemia (solid organ bloodless w/arterial obstruction, coagulation necrosis, heart attack affects heart, kidneys, spleen, brain...) or red (hemorrhagic w/secondary blood infiltrates))