[Connectivitis-like pathologies. Incomplete or initial connectivitis?]

Several cases of pathology comparable to connective tissue diseases, but not belonging to any of the established and well known classes are presented. Clinical and laboratory data were not always sufficiently indicative of connectivitis and in these cases the initial diagnostic doubt was never resolved even after months or years of follow-up. The advisability of early immunological therapy despite such doubts is then discussed.