Extra Pontine Myelinolysis without Striatal involvement Presenting as Pathological Crying, Reversible Parkinsonism and Dystonia.

A case of Central Pontine Myelinolysis and Extrapontine Myelinolysis presented with dystonia, Parkinsonism, and pathological crying that developed few days after gradual correction of hyponatremia. EEG slowing was evident before onset of symptoms, and disappeared with clinical improvement. Thalamic lesions alone produced these features. It dramatically responded to the Trihexyphenidyl therapy. Thus, basal ganglia involvement is not mandatory to produce this clinical picture; early onset of symptoms, resolution of EEG slowing and prompt response to anticholinergics may indicate better prognosis.