Dirofilariasis

Epidemiology

  • Rare etiology of solitary pulmonary nodule

Etiology

  • Dirofilaria immitis (dog heartworm)
    • Mosquito-acquired

Physiology

  • Humans are an imperfect host for this parasite: hence, dead immature larvae may embolize into pulmonary circulation, producing infarction and inflammation

Diagnosis

  • CXR/Chest CT Pattern
    • Well-defined nodule (involvement of larger pulmonary arteries may produce a wedge-shaped density simulating pulmonary infarction)
      • Location: no known predilection
      • Calcification: sometimes
      • Cavitation: sometimes
    • Infiltrative lesions (uncommon):

Clinical Manifestations

Pulmonary Manifestations

Other Manifestations

  • xxx

Treatment

  • No treatment is necessary in humans

References

  • xx