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Photodynamic therapy (PDT) for radiographically occult early stage lung cancer. (A) A 65-year-old male presented with abnormal sputum cytology and normal chest X-ray; (B) Bronchoscopy revealed an endobronchial abnormality at the orifice of the left upper division anterior segmental bronchus (arrow). Biopsy was positive for squamous cell carcinoma; and (C) Bronchoscopy six months post PDT (120 J/cm2) shows complete response with no residual tumour.
