Özet:

A case of hypersensitivity pneumonitis with symptoms of dyspnea and cough, with normal PA chest radiography and with the history of pigeon exposure was presented here. 66 years old male patient had complaints of dyspnea and cough since 3 months. His respiratory sounds were normal. He did not have any other environmental, occupational or drug exposure history.  In thorax high resolution computed tomography (HRCT), there were centriacinar nodules in the middle and lower lobes. When his anamnesis was re-evaluated, we learned that he was cleaning up pigeon droppings from roof every week. The patient was instructed to stop having direct and indirect contact with pigeons. A month later, the patient was re-evaluated. His cough and dyspnea were improved. In his followup thorax HRCT, centriacinar nodules were disappeared. We should always consider hypersensitivity pneumonitis in the patients with the complaints of dyspnea, cough, even if the PA radiography is normal; we should take the exposure history comprehensively.  Key words: Hypersensitivity pneumonia, centriacinar nodules, tomography

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