Mycotic pulmonary artery pseudoaneurysms ( PAPs) are rare but potentially fatal complications of infective disease in childhood. A 14-year-old boy with no specific past history presented with toxic shock syndrome and septic lung due to Streptococcus anginosus and subsequent pseudoaneurysms formation of the pulmonary artery while convalescing from sepsis. Contrasted computed tomography (CT) of the pulmonary and bronchial vasculature undertaken for investigation for complication of septic lung revealed multiple large PAPs in both lungs. He did not have hemoptysis or chest pain during a prolonged hospital stay and follow-up. The patient was managed conservatively with prolonged oral as well as intravenous antibiotics. Several multi-slice examinations were performed to follow these aneurysms over a period of 4 months. The PAPs were shown to start regression from the 3 weeks post-development and have been regressed almost completely at 4 months after the diagnosis.