eye disorder sialidosis sialidosis type 1 MEDGEN:44174 SCTID:34960006 cherry red spot myoclonus syndrome sialidosis type I Orphanet:812 GARD:0007639 Normomorphic sialidosis icd11.foundation:1154773192 cherry-red spot-myoclonus syndrome NANDO:2201191 myoclonus cherry red spot syndrome SCTID:723675006 MONDO:0019346 Sialidosis type 1 (ST-1) is a very rare lysosomal storage disease, and is the normosomatic form of sialidosis, characterized by gait abnormalities, progressive visual loss, bilateral macular cherry red spots and myoclonic epilepsy and ataxia, that usually presents in the second to third decade of life. NANDO:1200117 lipomucopolysaccharidosis normosomatic sialidosis UMLS:C0023806 familial mucolipidosis