What does it mean if there was a trace of mucopolysaccharidosis?

Hmmmm.....: "Trace" is not a word commonly used in the description of genetic disorders. The terms 'mosaic' and 'partial' are used to describe less severe forms of a genetic disorder in which not all of the particular chromosomes are affected. In the case of a lysosomal storage disease, 'trace' may be referring to only partial disruption of enzyme production (as with Morquio). Hope this helps....