Discussion
Diagnosis With Brief Discussion
- Diagnosis
- Acute eosinophilic pneumonia
- Radiologic Findings
- Initial chest radiograph shows prominent interstitial marking in both upper lung zones accompanied with ill-defined ground glass opacity in the right upper lobe.
On follow up chest radiograph of 2 days later, the extent of ill-defined patchy consolidations increased rapidly with ground glass opacities in peripheral portion of both upper lung zones.
Initial chest CT scan shows smooth interlobular septal thickening with multifocal patch ground glass opacity in both upper lobes and accompanied subpleural consolidations in both upper and lower lobes. There are small amount of bilateral pleural effusion.
On follow up chest radiograph of 5 days later, previously noted ground glass opacities and consolidations as well as interstitial thickening were markedly improved.
- Brief Review
- Acute eosinophlic pneumonia is a characteristic disease of diffuse alveolar damage with interstitial and alveolar eosinophil and mononuclear cell infiltration. It shows acute febrile illness lasting 1-5 days accompanied by myalgia, pleuritis chest pain and occasionally hypoxemic respiratory failure. Diagnostic criteria is 1) Acute febrile illness of less than 5 days duration, 2) Hypoxemic respiratory failure (PaO2 < 60mmHg on room air), 3) Diffuse mixed alveolar and interstitial chest radiograph infiltrates, 4) BAL eosinophilia (>25%), 5) No apparent infectious cause, 6) No history of asthma or allergic disease, 7) Rapid and complete response to corticosteroid therapy, 8) No relapse after discontinuation of corticosteroid therapy. Peripheral blood eosinophil count is usually normal, then elevated during clinical course.
Typical radiographic finding is diffuse bilateral reticular opacities with or without patchy consolidation and pleural effusion. On chest CT, it shows findings of bilateral patchy area of ground glass opacity and consolidation accompanied with poorly defined nodules and smooth interlobular septal thickening. Pleural effusion is commonly combined.
Possible differential diagnoses are hydrostatic pulmonary edema, ARDS, AIP, and atypical bacterial or viral pneumonia. But, clinicoradiologic differential diagnosis is often difficult.
- References
- 1. Jeong YJ, Kim KI, Seo IJ et al. Eosinophilic Lung Diseases: A clinical, Radiologic, and Pathologic Overview. RadioGraphics 2007; 27:617-639
2. Cheon JE, Lee KS, Jung GS, Chung MH, Cho YD. Acute eosinophilic pneumonia: Radiographic and CT findings in six patients. AJR 1996; 167:1195-1199
3. Takeshi J, Nostor LM, Masanori A et al. Eosinophilic lung diseases: Diagnostic accuracy of thin section CT in 111 patients. Radiology 2000; 216:773-780
4. King MA, Pope-Harman AL, Allen JN, Christofordis GA, Christoforidis AJ. Acute eosinophilic pneumonia: Radiologic and Clinical features Radiology 1997; 203:715-719
- Please refer to
- Case 105 Case 128 Case 200 Case 260 Case 480
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- Keywords
- Lung, Pleura, Eosinophilic lung disease,