2Light RW, Erozan YS, Ball WC. Cells in pleural fluid: their value in differential diagnosis. Arch Intern Med, 1973;132:854～860.
3Rusch VW, Harper GR. Pleural effusions in patients with malignancy. In: Roth JA, Ruckdeschel JC, Weisenburger TH, eds.Thoracic ONCOLOGY. Philadelphia: WB Saunders, 1989; 594.
4Marel M, Zrustova M, Stasny B, et al. The incidence of plerual effusion in a well-defined region: epidemiologic study in central bohemia. Chest, 1993; 104:1486～1489.
5Monte SA, Ehya H, Lang WR. Positive effusion cytology as the intial presentation of malignancy. Acta Cytol, 1987; 31: 448～452.
