Reversible nuclear oculomotor nerve paralysis. Caused by a primary mesencephalic hemorrhage.

A patient presented with a right hemiparesis and a left nuclear third nerve syndrome. The CT scan showed a hematoma of the left mesencephalon, near the oculomotor nucleus. After resorption of the hematoma, the nuclear symptomatology disappeared. This is the first description of a third nerve nuclear syndrome secondary to a mesencephalic hematoma.