摘要:Abstract Severe cardiac involvement is a common feature of mucopolysaccharidoses (MPS), but occurs only rarely in {MPS} {III} (Sanfilippo syndrome). We report herein a case of {MPS} III-A having cardiac involvement as its first manifestation. Analysis of the {SGSH} gene showed homozygosity for the novel mutation p.G80V. We propose that {MPS} disorders, including {MPS} III-A, should be included in the differential diagnosis of every case of cardiomyopathy presenting during the first year of life.