We report on 2 adult sibs with Sanfilippo syndrome type A (MPS IIIA; d
eficiency of heparin sulfamidase) who were less functionally impaired
than other reported individuals with this disorder, These individuals
expand our understanding of the range of clinical expression that one
may see in Sanfilippo syndrome type A. (C) 1994 Wiley-Liss, Inc.