Two cases of dirofilarial infection in the human being were reported. Dirofilarial infection is common in dogs but rather rare in human. A review of Japanese literature disclosed 13 cases of human dirofilarial infection. Scarcity of symptoms and its morphological similarity to tuberculosis or infarction as well as the popularity in pets suggest that the true incidence of infection may actually be higher than the above figure. Our cases alert us for the recognition of human dirofilarial infection, and careful examination of multiple sections in granulomatous or nonspecific infarcted lesions is suggested.
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