title: Pulmonary dirofilariasis: another coin lesion.
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.
mesh_terms: D004183:Dirofilaria immitis / Q000302:isolation & purification; D004184:Dirofilariasis / Q000473:pathology*; D005260:Female; D006801:Humans; D008174:Lung Diseases, Parasitic / Q000175:diagnosis*; D008875:Middle Aged