检查了１３０种疾病的８５５例胸腺及免疫器官的改变，将其萎缩分Ｉ～Ⅲ级。感染病程大于５天者萎缩呈重度。恶性瘤、自身免疫病、真菌感染多呈Ⅲ级。良性瘤、畸形、出血、大量羊水吸入等，虽病程长，但多呈Ｉ～Ⅱ级萎缩。我们认为多分叶核淋巴细胞是一种凋零坏死。对胸腺小体的萎缩消失过程：小体集中、变性、多个融合、囊性变解体与钙化解体消失进行了讨论。 A total of 855 cases of thymus and immune organ changes were examined in 130 diseases, and their atrophy was classified as I ~ III. Infections more than 5 days were atrophy was severe. Malignant neoplasms, autoimmune diseases, fungal infections were mostly grade Ⅲ. Benign tumor, deformity, bleeding, a large number of amniotic fluid inhalation, although longer duration, but mostly I ~ Ⅱ grade atrophy. We think that the multileaf nuclear lymphocytes are a kind of withering necrosis. The atrophy of thymus bodies disappears: the concentration of small bodies, degeneration, multiple confluence, cystic degeneration, and disappearance of calcification are discussed.