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Wuchereria-Like Filaria in an Artery, Associated with Pulmonary Infarction^*

In the reported cases of an infarct-like density caused by a filarial worm in a pulmonary artery the species involved usually was identified as a Dirofilaria. In most instances the worm was presumed to be D. immitis and was dead when discovered. In a recent such case the worm was identified as a sexually mature, infertile female Brugia, probably B. malayi, in a normal artery situated some distance from the lesion, and it apparently was alive when removed in resected lung tissue.

In the present case the findings were similar in that the worm was a living, sexually mature, infertile female lying free in a normal artery some distance from an infarct-like pulmonary density, but the morphological features evident in histopathological sections of the worm resembled those seen in Wuchereria bancrofti.

Accepted for publication December 20, 1973.

^* Supported in part by grant AI-04919 from the National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland.