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Common variable immunodeficiency (CVID) should be considered in atypical cases with unexplained chronic signs such as fever of unknown origin (even in older patients) after tuberculosis, HIV, neoplasia and connective tissue disease have been ruled out.Common causes of hypogammaglobulinaemia should be excluded before CVID is considered.CVID can mimic sarcoidosis.

A Misleading Diagnosis of Sarcoidosis in an Older Woman