Pulmonary Dirofilariasis

Abstract
A 67-year-old woman with a long history of debilitating rheumatoid arthritis developed a peripheral coin lesion in the lower lobe of the left lung. A wedge resection was done and pathologic study revealed noncaseating granuloma secondary to rheumatoid infection with Dirofilaria immitis, a nematode. Although rare, canine dirofilariasis should be considered in the differential diagnosis of coin lesions.

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