White et al. [11] reported a case of tetanus-associated lymphadenopathy in a 50-year-old female, with excisional biopsy showing sheets of small-to-medium-sized lymphocytes and a flow cytometry study interpreted as atypical T cell population; however, the diagnosis was subsequently reviewed to ‘pseudolymphomatous florid proliferation of CD4 + T cells in response to tetanus toxoid immune stimulation’. This evidence concerns the gene CD4 and Lymphadenopathy.