Pulmonary dirofilariasis in a Caucasian patient with metastasised osteosarcoma in a non-endemic European region

Occasionally, nematodes are transmitted by mosquitoes to subcutaneous tissues of humans. 2 In extremely rare cases such as extended periods of immunosuppression, worms migrate to the lungs and cause asymptomatic granulomatous coin lesions. 2 3 Microscopically, typical pulmonary nodules display a central thrombosed artery and the parasite in various stages of degeneration, often surrounded by eosinophilia. 4 To our knowledge, this is the first report of possible indigenous pulmonary dirofilariasis accompanying and mimicking lung metastasis in a patient with osteosarcoma.