Swelling of the optic nerve head due to the coexistence of idiopathic intracranial hypertension and optic nerve drusen

<p><strong>Introduction. </strong>Optic nerve head drusen (ONHD) is one of the most common congenital disorder of the optic nerve with prevalence from 0,5-2% in general population. Idiopathic intracranial hypertension is a condition that occurs in children, unlike adults, regardless of gender or the presence of obesity. Both conditions in children present on the eye as swelling of the optic disc, which is difficult to distinguish by clinical examination. They are extremely rarely associated.</p> <p><strong>Case report. </strong>A 15-year-old girl was urgently admitted due to decreased vision in both eyes for the past 7 days. Computerized visual field (CVP) testing revealed annular scotoma in both eyes, with a residual of 10 degrees and decreased sensitivity. Fundus examination showed an edematous both ONH. Echo B scan showed highly reflective changes corresponding to drusen in ONH. Acetazolamide 250 mg orally three times a day was introduced into the therapy. Neurological examination and MRI of endocranium was normal. After 3 weeks, VA in both eyes was 0.5 corrected with -0.50 Dsph to 1.0. ONH significant regression with unclear boundaries temporally, superiorly and inferiorly. The follow-up period over the next year, visual acuity was stable, and normal CVP, only slightly unclear boundaries of the ONH.</p> <p><strong>Conclusion. </strong>The diagnosis of optic nerve drusen is possible in children with benign intracranial hypertension. For this reason, it is necessary to thoroughly diagnose the patient in order to start treatment in a timely manner and prevent the development of visual impairment.</p>