胸膜间皮瘤是一种原发性胸膜肿瘤，分局限和弥漫型。良性呈局限型。恶性变呈弥漫型，偶为局限型。４０岁后多见。男性２倍于女性，右侧多于左侧［１］，早期症状不典型，易误诊。我院１９９０－１９９４年间其收治了３例，均有误诊。１病例摘要 例１，男，４５岁，反复上腹痛１ Pleural mesothelioma is a primary pleural tumor with localized and diffuse types. Benign is a limited type. Malignant transformation is diffuse type, even the limited type. More common after 40 years old. Males are two times as many as females, and the right side is more than the left side [1]. The early symptoms are not typical and are often misdiagnosed. During the period from 1990 to 1994, our hospital received 3 cases and were misdiagnosed. 1 Case summary Case 1, male, 45 years old, repeated epigastric pain 1