Clinical spectrum in 107 cases of toxoplasmic lymphadenopathy.

Lymphadenopathy is the most frequent clinical manifestation of acute acquired infection with Toxoplasma in the immunocompetent individual. One hundred seven cases of histologically verified toxoplasmic lymphadenitis were reviewed in an effort to determine the usual modes of clinical presentation and the incidence of extranodal disease. Toxoplasmic lymphadenitis most frequently involved a solitary lymph node in the head and neck regions, without systemic symptoms or extranodal disease and with a benign clinical course. However, serious extranodal disease did occur in some patients and included myocarditis, pneumonitis, encephalitis, chorioretinitis, and transmission of the infection to the fetus. Case histories are presented to illustrate important points with respect to clinical presentation, complications, and diagnosis.