IMAGES IN NEUROLOGY
|Year : 2021 | Volume
| Issue : 3 | Page : 419-420
Optic nerve head drusen masquerading as papilledema: A diagnostic dilemma
Vipin Rana, Atul Arora, Krinjeela Bazgain, Deeksha Sharma
Advanced Eye Centre, Post Graduate Institute of Medical Education and Research (PGIMER), Chandigarh, India
|Date of Submission||13-Jun-2020|
|Date of Acceptance||14-Jun-2020|
|Date of Web Publication||24-Jul-2020|
Dr. Atul Arora
Advanced Eye Centre, Postgraduate Institute of Medical Education and Research (PGIMER), Chandigarh - 160 012
Source of Support: None, Conflict of Interest: None
|How to cite this article:|
Rana V, Arora A, Bazgain K, Sharma D. Optic nerve head drusen masquerading as papilledema: A diagnostic dilemma. Ann Indian Acad Neurol 2021;24:419-20
| Clinical Description|| |
A 16-year-old boy with complaints of global headache for 1 month presented to our tertiary care center for ophthalmic examination. He was elsewhere diagnosed with idiopathic intracranial hypertension (IIH) and was started on Tab Acetazolamide 250 mg O.D. On ocular examination, his uncorrected visual acuity was 20/20 in both the eyes with normal intraocular pressure and pupillary reactions. The optic discs were mildly raised with blurred margins. However, no optic disc hyperemia was seen [Figure 1]a and [Figure 1]b. Ultrasound B scan showed hyperechogenicity of high amplitude over the optic disc in both the eyes [Figure 1]e and [Figure 1]f. Also, fundus autofluorescene (FAF) revealed hyper autofluorescence over the disc in both the eyes [Figure 1]c and [Figure 1]d. Patient was diagnosed to have optic nerve head drusen (ONHD) in both eyes.
|Figure 1: a-b: Fundus photo shows blurred optic disc margins in right and left eye respectively(yellow arrows). c-d: Fundus autofluorescence shows hyper autofluorescence at both optic discs (white arrowheads). e-f: Ultrasound B scan shows hyper-echogenicity at both optic discs. (white arrows)|
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| Discussion|| |
Originally described by Müller, optic nerve head drusen (ONHD) are acellular deposits of calcium, nucleic acids, amino acids, and mucopolysaccharides., These are of two types, that is, superficial and deep, and both are common in the nasal part of the disc and represent the same pathology. Approximately 60% of optic discs with drusen have superficial ONHD on clinical examination which are easily visible as they are lumpy bumpy, refractile, rounded, pale, and vary in size from small foci to large lobulated clusters., Buried ONHD (common in young patients) have a variable appearance, ranging from a near-normal optic disc to an elevated swollen appearance; thus can be difficult to differentiate clinically from optic disc edema. Buried ONHD are more common in young patients. As a consequence, they are more vulnerable to misdiagnosis, such as papilledema. In addition to blurred optic disc margins and the elevated optic disc, papilledema will have associated optic disc hyperemia with obscuration of the retinal vasculature at the disc margin, and associated hemorrhages and cotton wool spots may also be present which are usually not seen in ONHD. Different imaging modalities help to differentiate ONHD from true disc edema like ultrasonography (USG B scan), fundus autofluorescence (FAF), and computed tomography (CT). They appear as hyperechoic, highly reflective round structures with posterior acoustic shadowing on USG B scan. On FAF, ONHD appear as oval or round hyper autofluorescent structures with irregular edges. There is no definitive treatment for ONHD. Thus, ophthalmologists should conduct regular check-ups to rule out accompanying disorders like non-arteritic anterior ischemic optic neuropathy, subretinal neovascularization, and elevated intraocular pressure.
Clinically, presentation with blurred disc margins and elevated disc may masquerade as papilledema as in our case. Thus, such patients, if not having associated retinal findings like disc hyperemia, cotton wool spots, hemorrhages, and absence of neurological signs, should undergo multimodal imaging like fundus autofluorescence and USG B scan to clinch the diagnosis of ONHD. Therefore, early diagnosis of ONHD prevents unnecessary investigations and spares the patient from the anxiety of intracranial pathology.
Declaration of patient consent
The authors certify that they have obtained all appropriate patient consent forms. In the form the patient(s) has/have given his/her/their consent for his/her/their images and other clinical information to be reported in the journal. The patients understand that their names and initials will not be published and due efforts will be made to conceal their identity, but anonymity cannot be guaranteed.
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Conflicts of interest
There are no conflicts of interest.
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