Paracoccidioidomycosis has recently been classified into juvenile (acu
te) and adult (chronic) forms. The latter affects middle-aged men and
causes mucocutaneous lesions, while the more rare juvenile form affect
s the reticuloendothelial system of children and adults of both sexes
under 30 years of age. It is not yet known, however, if the patient's
age has a role in determining the immune response patterns to the fung
us and the evolution to one form or the other. We present a 45-year-ol
d man who presented with juvenile type disease characterized by intra-
abdominal polyadenopathy forming a large epigastric mass. Immune evalu
ation showed high titres of anti-Paracoccidioides brasiliensis antibod
ies and an antigen-specific cellular immune defect. Treatment resulted
in resolution of the clinical and immune abnormalities. His epidemiol
ogical background also suggested acute disease: he developed disease a
fter moving from an urban to a rural endemic area. We suggest that acu
te or juvenile disease may occur in a previously healthy, susceptible
individual when moving to an endemic area, at whatever age.