Summary Introduction Pulmonary dirofilariasis is an uncommon entity. Known as a zoonotic disease it can affect humans as a secondary host. A pseudo-tumor of the lung called “coin” lesion is usually detected while performing a chest X-ray for another reason. Observation We present a case of pulmonary dirofilariasis due to Dirofilaria sp. in a 72 year old immunocompetent patient who underwent surgery for suspicion of a neoplasm. Discussion Human pulmonary dirofilariasis should be evoked in asymptomatic patient from endemic area of canine dirofilariasis presenting with a pseudo tumor of the lung.