4例相当于严重联合免疫缺陷症,胸腺皮质全部为脂肪组织,髓质内无胸腺小体,其他各脏器内无淋巴滤泡或淋巴细胞。另4例每例各不相同,多数与遗传因素有关。余3例见皮髓质不能区分,小叶由正常结构的大血管及间隔分割,中心可见透明粉染小团,周围不见同心圆排列的上皮细胞及胸腺小体,相当于Borzy分类中的Partial Dysplasia。 4 cases equivalent to severe combined immunodeficiency disease, all of the thymus cortex of adipose tissue, medullary no thymus, other organs without lymphoid follicles or lymphocytes. The other 4 cases each different, most related to genetic factors. More than 3 cases can not distinguish between the corticomedullary, lobular by the normal structure of the large blood vessels and the separation of the center visible transparent powder dyed small groups around the concentric circle of epithelial cells and thymus, equivalent to Borzy classification Partial Dysplasia .