Multi-infarct dementia

Alternative Names

MID; Dementia – vascular; Dementia – poststroke

Definition of Multi-infarct dementia

Multi-infarct dementia (MID) is a form of dementia caused by a series of small .

Causes, incidence, and risk factors

Multi-infarct dementia (MID) is the second most common cause of dementia (after ) in people over age 65. MID affects men more often than women. The disorder usually affects people between ages 55 and 75.


Symptoms may develop gradually or may progress after each small stroke.

Signs and tests

Tests may be ordered to help determine whether other medical problems could be causing dementia or making it worse, such as:


There is no treatment to turn back damage to the brain caused by small strokes.

Expectations (prognosis)

Some improvement may occur for short periods of time, but the disorder will generally get worse over time.


Daniel B. Hoch, PhD, MD, Assistant Professor of Neurology, Harvard Medical School, Department of Neurology, Massachusetts General Hospital. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc. – 3/22/2010

Central nervous system

ADAM Medical Encyclopedia

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