pathological laughter


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An uncommon symptom usually caused by bilateral, diffuse cerebral lesions but which may rarely also be associated with isolated cerebral lesions and may herald midbrain infarction

pathological laughter

Uncontrolled laughter (occasionally accompanied by, or alternating with, uncontrolled crying), caused by pseudobulbar lesions of the brain. These lesions may result from lacunar strokes, multiple sclerosis, anoxic brain injury, and other forms of brain injury.
See also: laughter
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References in periodicals archive ?
Diagnosis and management of pathological laughter and crying.
Trochlear nerve neurinoma presenting as pathological laughter.
Gallagher JP Pathological laughter and crying in als: a search for their origin.