# Long-term follow-up of a Tay-Sachs disease patient with cherry-red spot

## TL;DR

This paper reports on the long-term progression of retinal degeneration in a Tay-Sachs disease patient, highlighting changes in cherry-red spots and retinal thinning.

## Contribution

The study provides detailed longitudinal ophthalmic data on Tay-Sachs disease, including advanced retinal involvement observed via flat ERG waveforms.

## Key findings

- Progressive retinal degeneration with optic atrophy and retinal thinning was observed over time.
- Cherry-red spots in the maculae reduced in size as the disease progressed.
- Flat ERG waveforms indicated more advanced retinal involvement than previously reported.

## Abstract

To describe the clinical progression and ophthalmic findings in a Japanese boy with Tay-Sachs disease at ages 5 and 8 months.

The patient was born at 38 weeks of gestation and developed normally until motor skill delays were identified at age 1 year and 1 month. At that time, brain magnetic resonance imaging revealed diffuse T2 hyperintensity in the bilateral basal ganglia. At age 1 year and 6 months, he was able to fix and follow objects, and the optic discs appeared normal, but bilateral cherry-red spots were observed in the maculae. Based on these findings, together with hypersensitivity to sound and markedly reduced β-hexosaminidase A activity, Tay-Sachs disease was biochemically diagnosed. By age 2 years and 1 month, the patient had lost the ability to fixate on and follow objects. Fundoscopy at age 4 years and 4 months revealed optic atrophy and reduced cherry-red spots, electroretinography (ERG) at age 4 years and 9 months showed a complete loss of retinal responses, and optical coherence tomography at age 5 years and 3 months demonstrated retinal thinning. Long-term observation revealed progressive degeneration, consistent with previous reports. Lipid deposition in all retinal layers was considered to contribute to retinal atrophy.

This report highlights progressive retinal degeneration with optic atrophy, retinal thinning, and reduction in cherry-red spots. The flat ERG waveform in this patient suggests more advanced retinal involvement than in previous reports and provides insights into the ocular manifestations of Tay-Sachs disease.