恶性组织细胞病（简称恶组）是单核－巨噬细胞系统异常增生的全身性疾病，典型的临床表现是发热、衰竭，肝、脾、淋巴结肿大，而浆膜腔积液者少见，易误诊。我们观察３例均误诊为浆膜腔结核，现分析报告如下。１病例介绍１．１例１，男，１９岁。无诱因左下肢膝关节以上肿... Malignant histiocytosis (abbreviated as the evil group) is a systemic disease in which the mononuclear-macrophage system is abnormally hyperplastic. The typical clinical manifestations are fever, failure, enlargement of the liver, spleen, and lymph nodes, while those in the serous cavity are rare. Misdiagnosed. We observed that 3 cases were misdiagnosed as serous cavity tuberculosis. The analysis report is as follows. 1 case presentation 1.1 cases 1, male, 19 years old. No incentive left lower limb knee joint swelling ...