ABSTRACT
The Authors report the clinical case of a patient with a deficit of humoral immunity who developed infections since puberty. The serum levels of IgG and IgA decreased progressively in the fourth decade of life, while serum IgM increased. Moreover, the patient developed a marked CD4+ T lymphocytopenia and a meager B lymphocytopenia, vitiligo, positivity for anti-SSA/Ro autoantibodies and granulomatous phlogosis of the knee. The heterogeneity of the clinical and laboratory data suggests that this patient might present an overlap immunodeficiency syndrome with some of the clinical and immunological features typical of the hyper-IgM syndrome (in the X-linked or autosomal forms) and others that can be referred to a nosologically distinct humoral immunodeficiency such as the common variable immunodeficiency.
