Abstract
A 78-year-old woman was referred to our hospital because of an abnormal shadow on a chest radiograph obtained during a routine medical check-up. Chest CT revealed an inflammatory lesion located in the left upper lobe. A year and seven months later, the lesion was found to have grown and was a mass about 3 cm in diameter. On bronchoscopy, a definitive diagnosis could not be made. FDG-PET confirmed abnormal accumulation in the lesion. These findings suggested a lung tumor. The patient had a left upper lobectomy and a lymph node dissection using video-assisted thoracoscopic surgery. Microscopically, the lumen of the cysts contained a mucous secretion and was covered with ciliated epithelia. The surrounding lung tissue included epithelioid granuloma composed of a lymphocyte and plasmacyte infiltration. The final diagnosis on pathology was that of a bronchial cyst. A bronchial cyst with uptake on FDG-PET is rare, and it should be considered in the differential diagnosis of lung cancer.
