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Merdžo, Ivan; Jurišić, Darija; Ćavar, Ivan; Striber, Neda
Taiwan journal of ophthalmology, 04/2024Journal Article
Mitochondrial encephalomyopathy, lactic acidosis, and stroke-like episodes (MELAS) syndrome is a rare condition. Here, we present a case of a male patient with a very unique combination of symptoms that started at the age of 12. Transient symptoms manifested after 4 days of high fever and included lethargy, a loss of appetite, and an inability to recognize faces. After that, the patient was symptom-free for 4 years before he was hospitalized again with a working diagnosis of acute disseminated encephalomyelitis. The ophthalmic symptoms at this stage were photophobia and discrete horizontal nystagmus. One year later, the patient had another seizure and during hospitalization, predominantly displayed cerebral symptoms such as dystaxia, dysmetria, generalized muscle hypotrophy, and absent myotonic reflexes. Like before, an ophthalmic examination demonstrated a best-corrected visual acuity of 1.0 and a normal anterior segment. A fundus examination revealed a slightly rarefied retina, along with areas of perifoveal and parapapillary atrophy, in addition to increased vascular tortuosity. Optical coherence tomography scans of the macula and the optic disc depicted a mild thinning of the retinal layers. Visual field testing showed an isopter contraction with a predominant loss of the temporal visual field in both eyes. A genetic serum analysis was positive for mitochondrial mutation m.3243A>G, and a diagnosis of MELAS was confirmed. The treatment included anticonvulsive drugs and dietary precautions. Patients with MELAS syndrome can manifest a wide range of visual disturbances, meaning that a detailed ophthalmic examination is required.
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