Objective: The pseudo-tumor cerebri (PTC) is defined as the idiopathic or benign intracranial hypertension (IH), complaints of which cannot be explained in a different way. PTC is an exclusion diagnosis, in which the neuroophtalmopathology of IH cannot be determined. The patients with PT[ may have complaints such as headache, nausea, vomiting, temporary blurred vision, and mild-level vision loss or unilateral or bilateral abducens nerve paralysis may develop. The radiological examination of patients yields normal results. In case that IH develops due to any reason, the enlargement is seen in optic nerve sheath diameter (ONSD) in the acute period.