Technology 'perfect' for pediatric neuro-ophthalmology diagnoses
This article was reviewed by Mays A. El-Dairi, MD
“It is the ‘perfect’ non-invasive technology in pediatric neuro-ophthalmology patients with clear media,” said Mays A. El-Dairi, MD, associate professor, Pediatric Ophthalmology and Strabismus, Neuro-Ophthalmology, Duke Eye Center, Durham, NC.
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In the pediatric population,
In some cases, if there is one, the database is extrapolated and it is not highly accurate. The normative database needs to be perfected.
In her neuro-ophthalmology practice, Dr. El-Dairi puts the
Viewing pediatric neuro-ophthalmic disease
In patients with optic nerve hypoplasia, while
Optic nerve coloboma also can be diagnosed without use of
Related: OCT artifacts and pitfalls: In the eye of the beholder
In cases of optic nerve head pit, the end of Bruch’s membrane is not visible.
“OCT is not needed to see the pit, but sometimes the pit can be associated with an area where the ganglion cell area did not form, which can help predict a problem with visual function,” she said, describing a patient who had 20/200 vision and was undergoing treatment for amblyopia. In actuality, she was able to determine that the ganglion cells that facilitate central vision had never formed in this patient.
A myelinated nerve fiber layer seen on an OCT image has a bright, thick, hyperreflective signal that is readily visible. In some cases of subtle pseudopapilledema, visualization of this signal is helpful to the diagnosis.
In all congenital optic nerve anomalies,
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“Upward bowing of the membrane can indicate the presence of a retrobulbar process, something that is pushing behind the optic nerve, or high intracranial pressure,” Dr. El-Dairi said. “This is not a very sensitive marker, but it is quite specific; I always look at it when a nerve is elevated.”
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The size of the Bruch’s membrane also can be evaluated using OCT. In patients with pseudopapilledema, the nerves tend to be smaller; the RNFL is under 120 μm and Bruch’s membrane opening is less than 1,500 μm. When compared with true papilledema, the pseudopapilledema nerves are larger; Bruch’s membrane opening exceeds 1,650 μm and the RNFL is thicker than 135 μm.
In optic neuritis, imaging shows RNFL thickening even when no edema is seen during funduscopy. When optic atrophy becomes apparent, RNFL thinning is seen that is correlated with the final visual outcome.
“Imaging of the RNFL is not useful for diagnosing optic neuritis, but new baseline images are useful to have six months after resolution to more readily identify a recurrence,” she advised.
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Dr. El-Dairi does, however, like to use
“A macular scan can show changes in the retina, such as subretinal fluid and disrupted photoreceptors,” she explained.
Atrophic nerves are seen as thinning on the RNFL scan and macular map. Cystic lesions also may be visible in the inner nuclear layer.
“It is important to remember that when there is atrophy on top of papilledema, it is hard to determine how much is atrophy and how much is papilledema,” Dr. El-Dairi noted.
In a case of hydrocephalus, in which the patient had 20/400 vision, the RNFL measured about 80-plus μm and while the referring physician thought the patient was fine and had non-organic visual loss, the ganglion cell layer was actually absent.
Dr. El-Dairi relies on OCT to monitor the visual fields in young patients. In some cases, imaging will show changes at the macular level and homonymous thinning is seen that is correlated with visual field deficits.
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In infants with nystagmus, she performs hand-held OCT evaluations to establish the need for electroretinography or neuroimaging.
Examples include Stargardt’s disease, retinoschisis, Best’s disease, and cone dystrophy, which have pathognomonic findings on the retinal OCT.
Related: A
In an example of Leber congenital amaurosis, Dr. El-Dairi highlighted the normal ganglion cell layer and the significantly attenuated photoreceptor layer. She showed examples of different stages of retinitis pigmentosa that show only rod involvement initially that progresses to both rod and cone involvement.
Batten disease shows a very specific pattern on imaging-both the outer and inner retina are involved, there is severe attenuation of the ganglion cell layer, and the outer photoreceptors are significantly damaged.
“High-resolution OCT imaging tomograms of the retinal tissues can frequently reveal pathology that is difficult to detect with the naked eye,” Dr. El-Dairi concluded. “With extra anatomic finding, it can help determine the path for further workup.”
Mays A. El-Dairi, MD
E: [email protected]
Dr. El-Dairi has no financial interest related to this topic.
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