Löffler's Syndrome on Chest X-Ray
Löffler's syndrome characteristically shows migratory pulmonary infiltrates on chest radiograph 1, 2.
Radiographic Appearance
The chest X-ray findings in Löffler's syndrome include:
- Transient, migratory pulmonary infiltrates - These are the hallmark feature, appearing as patchy airspace opacities that change location over days to weeks 1, 2, 3
- Bilateral involvement is common, though asymmetric distribution may occur
- Ground-glass opacities - Often seen as hazy, poorly defined areas of increased density 4, 5
- Patchy consolidation - May appear in any lung zone but frequently involves lower zones 6
- Normal lung volumes - Unlike other interstitial lung diseases, lung volumes remain preserved
Clinical Context
These radiographic findings occur during the prepatent period (1-2 weeks post-infection) when helminth larvae migrate through the lungs 1, 2. The most common causative organisms are:
- Ascaris lumbricoides
- Hookworm species
- Strongyloides stercoralis
Key Diagnostic Features
The diagnosis is primarily clinical since symptoms occur before parasites can be detected in stool 1, 2. The combination of:
- Migratory pulmonary infiltrates on imaging
- Peripheral blood eosinophilia
- Respiratory symptoms (fever, dry cough, wheeze, rarely hemoptysis)
- Recent travel to endemic areas or soil exposure
...strongly suggests Löffler's syndrome 2, 3.
Important Caveats
Abnormal chest radiography occurs in 95% of patients 5, but the infiltrates are characteristically transient and migratory - meaning repeat imaging days later may show resolution of previous infiltrates with new ones appearing elsewhere 7. This migratory pattern distinguishes Löffler's syndrome from bacterial pneumonia, which typically shows fixed consolidation 6.
CT imaging provides more detail, showing peribronchiolar nodular infiltrates and ground-glass opacities, though chest X-ray remains the primary screening modality 2, 5.