Abstract
A family is described in which 3 children have neuronal ceroid lipofuscinosis and 2 of them also have an arthropathy. Clinically the children have the late infantile form but pathological evidence shows the recognized overlap with the juvenile form. A 4th child with joint involvement but with normal skin biopsies is described. This family apparently has a specific form of neuronal ceroid lipofuscinosis with arthropathy, accumulation of metabolites in this storage disease may be age dependent.