Simple pulmonary eosinophilia is inflammation of the lungs from an increase in eosinophils, a type of white blood cell.
Most cases of this condition are due to an allergic reaction from:
- A medicine, such as a sulfonamide antibiotic or nonsteroidal anti-inflammatory drug (NSAID)
- Infection with a fungus such as Aspergillus fumigatus or Pneumocystis jirovecii
- A parasite, including the roundworms Ascariasis lumbricoides, or Necator americanus, or the hookwormAncylostoma duodenale
In some cases, no cause is found.
Exams and Tests
The health care provider will listen to your chest with a stethoscope. Crackle-like sounds called rales may be heard. Rales suggest inflammation of the lung tissue.
Chest x-ray usually shows abnormal shadows called infiltrates. They may disappear with time or reappear in different areas of the lung.
A bronchoscopy with washing may show a large number of eosinophils.
A procedure that removes the stomach contents (gastric lavage) may show signs of the Ascaris worm or another parasite.
If you are allergic to a medicine, your provider may tell you to stop taking it. Never stop taking a medicine without first talking with your provider.
If the condition is due to an infection, you may be treated with an antibiotic or anti-parasitic medicine.
Sometimes, anti-inflammatory medicines called corticosteroids are given.
The disease often goes away without treatment. If treatment is needed, the response is usually good. But, the disease can come back, especially if the condition does not have a specific cause and needs to be treated with corticosteroids.
A rare complication of simple pulmonary eosinophilia is a severe type of pneumonia called acute idiopathic eosinophilic pneumonia.
When to Contact a Medical Professional
See your provider if you have symptoms that may be linked with this disorder.
This is a rare disorder. Many times, the cause cannot be found. Minimizing exposure to possible risk factors, such as certain medicines or parasites, may reduce the chance of developing this disorder.
Pulmonary infiltrates with eosinophilia; Loffler syndrome; Eosinophilic pneumonia; Pneumonia - eosinophilic
Cottin V, Cordier JF. Eosinophilic lung diseases. In: Broaddus VC, Mason RJ, Ernst JD, et al, eds. Murray and Nadel's Textbook of Respiratory Medicine. 6th ed. Philadelphia, PA: Elsevier Saunders; 2016:chap 68.
Kim K, Weiss LM, Tanowitz HB. Parasitic infections. In: Broaddus VC, Mason RJ, Ernst JD, et al, eds. Murray and Nadel's Textbook of Respiratory Medicine. 6th ed. Philadelphia, PA: Elsevier Saunders; 2016:chap 39.
Update Date 6/22/2015
Updated by: Denis Hadjiliadis, MD, MHS, Associate Professor of Medicine, Pulmonary, Allergy, and Critical Care, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA. Also reviewed by David Zieve, MD, MHA, Isla Ogilvie, PhD, and the A.D.A.M. Editorial team.