Tay-Sachs disease (G(1/2) gangliosidosis I) is an autosomal recessive
lysosomal-storage disorder confined to the central nervous system, res
ulting from deficiency of hexosaminidase A. The case presented is of a
twelve-month-old girl brought to the hospital because of mental-motor
deterioration and convulsions. She was the child of first cousins and
had a history of the deaths of two siblings with the same manifestati
ons. Generalized hypotonia, macrocephaly, hyperacusis and a retinal ch
erry red spot appearance were present. There was no organomegaly. The
diagnosis of Tay-Sachs disease was made by means of absence of serum h
exosaminidase A activity.