versión impresa ISSN 0004-2749
Arq. Bras. Oftalmol. vol.75 no.1 São Paulo enero/feb. 2012
CASE REPORT RELATO DE CASO
Descolamento de retina e atrofia girata da coroide e retina: relato de caso
Rodrigo Fabri BerbelI; Paulo Igor RauenII; Raphael Frangiote PalloneII; Antônio Marcelo Barbante CasellaI
IPhysician, Ophthalmology Department, Universidade Estadual de Londrina - UEL - Londrina (PR), Brazil
IIPhysician, Hospital de Olhos de Londrina, Londrina (PR), Brazil
To report a case of gyrate atrophy of the choroid and retina associated with retinal detachment. Hyperornithinemia confirmed the diagnosis of gyrate atrophy. Pars plana vitrectomy with silicone oil infusion was performed with good anatomical results, despite the persistence of low visual acuity. Retinal detachment is a rare complication of gyrate atrophy and can be managed with pars plana vitrectomy and silicone oil. We discuss the possible mechanisms that led to low visual acuity.
Keywords: Gyrate atrophy; Vitamin B 6/metabolism; Retinal degeneration/surgery; Retinal detachment/surgery; Vitrectomy/methods; Silicone oils/administration & dosage; Visual acuity; Case reports; Humans; Female; Adult.
Descrever um caso de atrofia girata da coroide e retina associado com descolamento de retina. Altos níves de ornitina sérica confirmaram o diagnóstico de atrofia girata. Vitrectomia via pars plana com infusão de óleo de silicone foi realizada, com bom resultado anatômico, apesar da baixa acuidade visual persistente. Descolamento de retina é uma rara complicação da atrofia girata e pode ser manejada com vitrectomia via pars plana e óleo de silicone. Discutiremos os possíveis mecanismos que levaram à baixa acuidade visual.
Descritores: Atrofia girata; Vitamina B 6/metabolismo; Degeneração retiniana/cirurgia; Descolamento retiniano/cirurgia; Vitrectomia/métodos; Óleos de silicone/administração & dosagem; Acuidade visual; Relatos de casos; Humanos; Feminino; Adulto
Gyrate atrophy (GA) of the choroid and retina is a rare autosomal recessive disorder characterized by progressive metabolic retinal and choroidal degeneration due to a deficiency of the pyridoxal phosphate-dependent mitochondrial matrix enzyme ornithine delta(Δ)-aminotransferase (OAT)(1). Hyperornithinemia is the primary biochemical manifestation of OAT deficiency, with a 10- to 20-fold higher systemic level of ornithine in plasma, urine, spinal fluid, and aqueous humor. The cDNA and genomic locus for OAT has been isolated and assigned to chromosome 10(2).
Areas of progressive atrophy of the choroid and retina can be observed in the mid-periphery with exposure of the sclera and reduced visual acuity, as poor as 20/200 or worse. The low visual acuity may be related to subcapsular cataract, optic atrophy, macular edema or vasculitis(3,4). Only sporadic cases associating GA with retinal detachment (RD) have been observed in the literature(3).
A 32-year-old Brazilian housewife complained of long-term low visual acuity with noticeable worsening in the right eye (OD) over the last 20 days. She had a history of high myopia and cataract surgery with an intraocular lens implant in the OD five years ago and presented with visual acuity of light perception (LP) in the OD and no LP in the left eye. Normal intraocular pressure was found. Confluent areas of atrophy of the retina and choroid with exposure of the sclera were observed in the retinal mapping examination. Furthermore, a flat detachment of the inferior retina was revealed. Elevated levels of plasma ornithine were also detected (430 micromol/L).
With a diagnostic hypothesis of gyrate atrophy of the choroid and retina, the patient was submitted to a surgical treatment that consisted of retinopexy with scleral introflexion, pars plana vitrectomy, membranectomy, infusion of liquid perfluorcarbons, endolaser and silicone oil instillation. Laser photocoagulation was quite difficult to perform due to extensive areas of atrophy, which made good adherence of the retina to the choroid impossible. Currently, five months after surgery, the patient has hand motion vision in the OD with attached retina. She is currently being followed up by a nutritionist and a clinical physician for the control of plasma ornithine levels.
A GA treatment protocol has not yet been established but could involve lowering ornithine levels by nutritional means, such as restricting the intake of arginine, the precursor of ornithine(5-7). Another measure taken, in an attempt to increase OAT activity, has been the use of pyridoxine. Patients who respond to the administration of vitamin B6 with a reduction in plasma ornithine levels generally have a milder clinical course. Studies using nutritional methods with long-term follow up have demonstrated a slower progression but not regression(7).
In our case, normal levels of ornithine have not been achieved, and promising results related to visual acuity are still sought.
The patient presented with pseudophakia with rounded, atrophic alterations in the mid-periphery with retinal detachment in both eyes. It was decided to proceed with pars plana vitrectomy and infusion of silicone oil, seeing that besides the patient's pseudophakia, the same alterations of the illness that led to atrophy of the retina and choroid would also impede laser scarring in the periphery, hindering the adherence of the retinal pigment epithelium to the choroid. Silicone oil, therefore, was left in place for a longer postoperative period to avoid new retinal detachment (Figure 1).
In the current literature worldwide, there is only one case of GACR with RD, where silicone oil was also used to maintain the application of the retina3. We discovered no reason why the patient developed such a low visual acuity (VA), despite retinal positioning. We find it plausible, then, that the retinas of patients with this disease could have a natural outcome that often leads to very low VA, or they could be more sensitive to factors such as intraocular pressure, the height of the infusion bottle during vitrectomy surgery or contact with silicone oil. Some studies have reported silicone oil toxicity to the optic nerve(8), causing atrophy as well as having a damaging effect on the retinal pigment epithelium (RPE)(9) and an inflammatory action. Comparing this with a histopathologic study(10) that demonstrated alterations at the RPE level by GA could explain, at least in part, the low VA.
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Rodrigo Fabri Berbel
Universidade Estadual de Londrina
Av. Bandeirantes, 500 - Office 110
Londrina (PR) - 86010-010 - Brazil
Submitted for publication: October 1, 2010
Accepted for publication: August 10, 2011
Study carried out at the Departament of Ophthalmology, Universidade Estadual de Londrina - Londrina - Brazil.
Funding: No specific financial support was available for this study.
Disclosure of potential conflicts of interest: R.F.Berbel, None; P.I.Rauen, None; R.F.Pallone, None; A.M.B.Casella, None.
Editorial Note: After completing the confidential analysis of the manuscript, ABO discloses, with her agreement, the name Dr. Rosane da Cruz Ferreira as a reviewer. We thank her effort and expertise in participating in this process.