Chronic eosinophilic pneumonia in a breast cancer patient post-radiation therapy: a case report.

Chronic eosinophilic pneumonia (CEP) is a syndrome associated with nonspecific pulmonary and atopic manifestations, chest imaging findings suggestive of peripheral alveolar opacities, and alveolar and blood eosinophilia.1 Onset is insidious, with symptoms lasting up to 2–4 weeks. It is usually idiopathic; however, it has been associated with drugs, allergy shots, parasites, irradiation for breast cancer, and rheumatoid arthritis.2,3 It is a rare disease and usually a diagnosis of exclusion.4 CEP was first described by Carrington in 1969.5 In this case, a female patient with a history of allergic rhinitis and breast cancer developed CEP 6 years after she completed radiation therapy.