An infant is reported who presented with Pneumocystis carinii pneumonia, secondary to HIV infection, diagnosed at 3 months of age, and who had concurrent paravertebral neuroblastoma. Although neuroblastoma cell lines support the growth of HIV in vitro, this is the first report of a clinical association between HIV infection and neuroblastoma. Although we do not think the conditions are causally linked, we report the case to raise awareness of a possible association between HIV and neuroblastoma. The case also raises the importance of starting antiretroviral treatment with three drugs.