中线恶性组织细胞增生病(中线恶组)又称致死性中线肉芽肿或恶性肉芽肿,由于本病临床、病理较复杂,易误诊为炎症或未分化癌等。我们收集近13年所遇到的21例误诊病例,并就其误诊原因进行分析。1　资料与方法1986年7月～1999年6月的13年间,湖南医科大学病理学教研室接受外院病理切 Midline malignant histiocytosis (middle-line evil group), also known as fatal midline granuloma or malignant granuloma, due to the clinical, pathological complexity of this disease, often misdiagnosed as inflammation or undifferentiated cancer. We collected 21 cases of misdiagnosis cases encountered in the past 13 years and analyzed the causes of misdiagnosis. 1 Materials and Methods During the 13 years from July 1986 to June 1999, the Department of Pathology, Hunan Medical University received a pathological cut from the external hospital.