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巨噬细胞与周围已转化的和未转化的淋巴细胞的堆积团称为免疫岛。观察了１２０例患者的胸腹液涂片，发现５２例（４３．３％）患者的胸腹液中存在免疫岛。在１４例结核性胸腹液中ＩＩ例查见免疫岛，每份涂片面积（２．０ｃｍ×２．５ｃｍ）平均免疫岛数５９．６±１２．８个。在６０例恶性胸腹液中，２９例（４８％）查见免疫岛，每份涂片面积（２．０ｃｍ×２．５ｃｍ）平均免疫岛数３９．２±１８．９个。引起免疫岛的可能机制是病原微生物、肿瘤抗原等异物刺激机体免疫反应的结果。
Clusters of macrophages with surrounding transformed and untransformed lymphocytes are called immune islands. Thoracoabdominal fluid smears were observed in 120 patients and found that there were immune islands in the pleural and / or abdominal fluid of 52 patients (43.3%). Immune island was detected in 11 cases of tuberculous pleural and peritoneal fluid in 14 cases. The average number of immune island per smear area (2.0cm × 2.5cm) was 59.6 ± 12.8. In 60 cases of malignant pleural and peritoneal fluid, 29 cases (48%) were seen immune islands, the average number of immune islands per smear area (2.0cm × 2.5cm) 39.2 ± 18.9. The possible mechanism of causing immune islands is the result of the immune response of organisms such as pathogenic microorganisms and tumor antigens to stimulate the body.