Abstract
Pulmonary actinomycosis is an important differential diagnosis in patients with long-standing pulmonary infiltrates related to poor oral hygiene or compromised immune function. Up to a quarter of cases of thoracic actinomycosis are misdiagnosed as lung malignancy. Here, we report a 56-year-old man with a hypodense lesion in the left lower lobe presenting with recurrent massive haemoptysis for about one year. He underwent left lower lobe lobectomy due to intractable haemoptysis. Histopathological examination demonstrated actinomycosis infiltrating the left lower lobe. Rarity of the case was the presence of actinomycosis in an immunocompetent individual and without underlying preexisting lung disease. Also, intractable massive haemoptysis necessitating surgical excision which proved to be both diagnostic and curative due to actinomycosis is an unusual occurrence.