Abstract
Background
To report the clinical features of a patient with melanoma-associated retinopathy (MAR) with anti-transient receptor potential cation channel, subfamily M, member 1 (TRPM1) autoantibodies showing concomitant Off-bipolar cell dysfunction.
Methods
We evaluated a patient with a past history of scalp melanoma presented with sudden-onset shimmering photopsia in both eyes. MAR was confirmed with complete ophthalmic examinations, electronegative electroretinogram (ERG), and the presence of anti-TRPM1 autoantibodies by Western blot analysis. S-cone ERG and photopic On–Off ERG were studied in this patient as well.
Results
The patient's best-corrected visual acuity was 6/30 in the right eye and 6/8.6 in the left eye. Fundus and OCT findings were unremarkable. Visual field test showed severe constriction in both eyes. His full-field ERG was electronegative. S-cone ERG recorded preservation of L/M-cone-mediated response and undetectable S-cone-mediated response. Photopic On–Off ERG disclosed attenuated On- and Off-response. Western blot analysis confirmed immunoreactivity of the patient’s serum to a 30 kDa TRPM1 recombinant protein. Whole-body positron emission tomography scan detected lymph node metastases in the neck.
Conclusions
Anti-TRPM1 autoantibody-positive MAR varies greatly in its presentation and clinical course. We present a case of anti-TRPM1 autoantibody-positive MAR with atypical feature of Off-bipolar cell involvement. A complete electroretinographic study together with identification of the pathogenic antiretinal autoantibodies may help better understand and subclassify the disease in the future.
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Funding
This study is supported by Taipei Veterans General Hospital Grant VGH (V111C-099) and Ministry of Science and Technology of Taiwan Grant (MOST 110-2314-B-075-054-MY3).
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Hung, WC., Cheng, HC. & Wang, AG. Melanoma-associated retinopathy with anti-TRPM1 autoantibodies showing concomitant Off-bipolar cell dysfunction. Doc Ophthalmol 145, 263–270 (2022). https://doi.org/10.1007/s10633-022-09901-y
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DOI: https://doi.org/10.1007/s10633-022-09901-y