Solitary Nodular Pure Bronchioloalveolar Carcinoma

irregular borders ( fig. 2 ). It was histologically diagnosed as a pure nonmucinous bronchioloalveolar carcinoma (BAC) ( fig. 3 ). The patient was alive without signs of tumor recurrence 6 months later. BAC is known for low FDG uptake presumed to be secondary to the lower proliferation rate of these tumors [1] . Particularly low metabolic activity is observed in pure BAC, unifocal and mucin-containing tumors [2] . Furthermore, in small lesions activity is underestimated due to partial volume effect. A 75-year-old female nonsmoker was investigated for an ovarian mass. A CT scan showed a 1.8-cm incidental nodule in the right upper lobe (posterior segment), with spiculated borders, reaching the pleura. Its center was discretely excavated. PET/CT fusion, CT and PET scan showed faint FDG uptake by the nodule ( fig. 1 ). Following a CT-guided biopsy of the nodule, a right upper lobe resection was performed. Macroscopic examination showed a 1.4-cm subpleural nodule with well-defined but Published online: January 16, 2009