胸腺瘤和胸腺增生均可导致纵隔阴影的增宽和变形,胸腺瘤是前纵隔中最常见的肿瘤,约占50%[1]。国内有关胸腺瘤与胸腺增生的CT诊断报道较少。本文收集我院从1990年至1997年间经CT检查,手术病理证实的20例胸腺瘤,6例胸腺增生,结合文献,就其CT表现,诊断及鉴别诊断探讨如下。1　资料 Thymoma and thymus hyperplasia can lead to mediastinal shadow broadening and deformation, thymoma is the most common anterior mediastinal tumor, accounting for about 50% [1]. The domestic CT diagnosis of thymoma and thymus hyperplasia less reported. This collection of our hospital from 1990 to 1997 by CT examination, surgical pathology confirmed 20 cases of thymoma, 6 cases of thymus hyperplasia, combined with the literature on its CT findings, diagnosis and differential diagnosis are discussed below. 1 data