Clinical manifestations
Patients with chronic eosinophilic pneumonia typically present with:
- Non-productive (dry) cough.
- General constitutional symptoms (fatigue, malaise).
- Blood test abnormalities in the form of elevated eosinophil counts (peripheral eosinophilia).
Radiological imaging (CT)
Computed tomography plays a key role in establishing the diagnosis. Typical radiological findings include:
- Localization: Air-space opacities predominantly in the upper lung zones.
- Distribution: Peripheral arrangement of infiltrates running parallel to the chest wall. This pattern is classically described as the "photographic negative" of pulmonary edema (in which changes are typically central).
- Features: Opacification zones are not limited by anatomical borders of lobes or segments.
Differential diagnosis with COP
An important aspect is differentiating chronic eosinophilic pneumonia from cryptogenic organizing pneumonia (COP).
The main distinguishing feature on CT is the presence of nodules. In COP, nodular lesions are visualized in approximately 32% of patients. At the same time, nodules are atypical for chronic eosinophilic pneumonia and occur in only 5% of patients.
Briefly: answers to topical questions
What bronchoalveolar lavage (BAL) cellular composition parameters are characteristic of chronic eosinophilic pneumonia?
Eosinophilic pneumonia is characterized by specific changes in the cellular composition of bronchoalveolar lavage, which are used for differential diagnosis with idiopathic pulmonary fibrosis.
| Parameter | Characteristics in eosinophilic pneumonia |
|---|---|
| Eosinophils | Higher level than in idiopathic pulmonary fibrosis |
| Neutrophils | Lower level than in idiopathic pulmonary fibrosis |
Other specific lavage cellular composition parameters for this disease are not specified in the provided materials.
What other lung diseases are accompanied by pulmonary eosinophilia syndrome?
Pulmonary eosinophilia syndrome is accompanied by a wide group of primary and secondary respiratory diseases.
In addition to chronic eosinophilic pneumonia, the idiopathic group includes:
- Simple pulmonary eosinophilia — Löffler syndrome.
- Acute eosinophilic pneumonia — an idiopathic disease.
- Hypereosinophilic syndrome — an idiopathic condition.
Pulmonary eosinophilia is also found in the following pathologies:
- Bronchial asthma (Asthma) — often accompanied by infiltration of the lungs with eosinophils.
- Eosinophilic granulomatosis with polyangiitis (EGPA) — systemic vasculitis (formerly Churg-Strauss syndrome).
- Infectious conditions — parasitic (ascariasis, paragonimiasis), fungal (Aspergillus), bacterial (tuberculosis), and viral.
- Drug-induced diseases — associated with NSAIDs, cocaine, minocycline, and other drugs.
- Oncological diseases — certain types of cancer.
Class and exam questions
What is the "photographic negative" sign of pulmonary edema?
In classical pulmonary edema, infiltration is located centrally, around the hila. In chronic eosinophilic pneumonia, opacities are localized peripherally, along the chest wall, creating a "reverse" (negative) pattern.
Which blood tests confirm the diagnosis?
The key laboratory finding is the presence of peripheral eosinophilia.
How to distinguish this disease from cryptogenic organizing pneumonia (COP) on CT?
The main landmark is nodules. They are relatively characteristic of COP (up to a third of cases), while in chronic eosinophilic pneumonia they are extremely rare (about 5%).
What else to study on this topic
- Pulmonary alveolar proteinosis (PAP): pathogenesis and forms
- Crazy-paving CT pattern in PAP
- Technique of therapeutic whole-lung bronchoalveolar lavage
- Alveolar microlithiasis: SLC34A2 mutation
- "Sandstorm" radiological sign in alveolar microlithiasis
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