Sir,

Idiopathic intracranial hypertension (IIH), also called ‘pseudotumour cerebri’, is a syndrome characterized by increased intracranial pressure with associated signs and symptoms, but without localizing neurologic findings. Although it is usually a self-limiting condition, some patients may lose their vision. It was not until the 1980s that studies began to document this high incidence of visual loss. Moderate-to-severe vision loss has since been reported in over 50% of patient referral groups.1,2,3 IIH is not a rare disease.1 Population-based studies have documented annual incidence rates of 1–2 per 100 000 people.4 For the high-risk group of obese women in their reproductive age, the annual incidence climbs to 19–20 per 100 000 people.4 Important risk factors, including female gender, reproductive age, obesity, recent weight gain, and menstrual irregularities, have also been well documented.

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