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Deppen et al report that PET-CT's specificity for lung cancer was only 40% among 211 patients undergoing resection for presumed lung cancer at Vanderbilt in Nashville, TN, an area endemic for histoplasmosis. Twenty-two of 43 benign nodules were granulomas; most were positive on PET-CT (~60%). Ann Thorac Surg 2011;92:428-433.