Sialidosis is a rare autosomal-recessive lysosomal storage disease due to mutations in the gene leading to a deficit of alpha-n-acetyl neuraminidase and causing aberrant accumulation of sialylated glycoproteins/peptides and oligosaccharides in the lysosomes of various organs and tissues. Type II sialidosis (dysmorphic form) is classified into three subgroups based on the age of onset and the clinical severity: Congenital or neonatal, infantile (onset 0-12 months) and juvenile form (onset 13 months-20 years). We report the case of a 3-year-old boy with sialidosis type II infantile form, who developed a voluminous ascites.
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