EP can lead to irreversible lung damage.
Eosinophils accumulate in the lung parenchyma.
Eosinophils have been described as angry-looking cells because they contain cytotoxic substances, such as basic eosinophilic protein. Exact numbers are unknown, probably less then 0.1 per 100,000. CEP causes symptoms over months and years and rarely resolves spontaneously. CEP involves all ages, with peak incidence in the fifth decade. AEP progresses with increasing symptoms over several days.