Rapidly progressive pulmonary actinomycosis

This clinical image documents a rare case of rapidly progressive pulmonary actinomycosis in a patient initially seen in lung cancer clinic. Despite radiological findings suggestive of malignancy, biopsy was consistent with a diagnosis of actinomycosis. The patient responded well to prolonged antibiotics with significant clinical improvement. This case highlights the importance of considering actinomycosis even in rapidly progressive cases and emphasises the need for tissue diagnosis in patients with suspected lung cancer.