Principles of diffusion-weighted imaging -- Normal brain and artifacts -- Brain edema: Classification. Cytotoxic edema. Edema of neuron and glial cell. Intramyelinic edema. Axonal edema. Vasogenic edema -- Infarction: Arterial infarction. Venous infarction -- Dementia: Alzheimer's. Multi-infarct dementia. Other dementias. HIV dementia -- Hemorrhage -- Vasculitis/Vasculopathy: Behcet. Systemic l…