Human pulmonary dirofilariasis.

Dirofilaria immitis, the canine heartworm, is a relatively rare, but well-documented cause of human lung disease. The disease presents in man as a solitary, peripheral parenchymal lung nodule which may simulate a peripheral lung neoplasm. This case is the first report of the disease in New Zealand, a country where the parasite has not become established in the dog population. A brief review of the life cycle, epidemiology and clinical data relating to human dirofilariasis is included.