An additional male child with dysgammaglobulinemia is reported. In this instance an older sibling, deceased, had clinical and histopathologic findings suggestive of a congenital gamma globulin deficiency.

The preponderance of males among recognized examples of dysgammaglobulinemia, and the presently reported patient whose male sibling also appears to have had a congenital gamma globulin deficiency, suggest that dysgammaglobulinemia, in this particular family, was transmitted as a sexlinked recessive characteristic.

It remains unclear whether agammaglobulinemia and dysgammaglobulinemia represent two closely related genetic abnormalities, or whether they represent variable expression of a single genetic disorder. Study of additional pedigrees containing examples of dysgammaglobulinemia will be required to answer this question.

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