胸腺瘤于主任

1、胸腺瘤（縱膈病變）,正常胸腺組織學(xué),The cortex is composed of an extensive population of T cell precursors (also called thymocytes), dispersed epithelial reticular cells, and macrophages. Because the cortex is richer in small lymphocytes

2、than the medulla, it stains more darkly. The epithelial reticular cells are stellate cells with light-staining oval nuclei. They are usually joined to similar adjacent cells by desmosomes . Bundles of intermediate kerati

3、n filaments (tonofibrils) in their cytoplasm are evidence of the epithelial origin of these cells. A subpopulation of epithelial reticular cells present in the cortex consists of thymic nurse cells (TNCs), which contain

4、many (20–100) maturing lymphocytes in their cytoplasm.,胸腺組織從青春期后開始經(jīng)歷正常的退化過程,Section of the thymus of an elderly adult. Severe atrophy of the parenchyma, which was partially replaced by adipose tissue, can be seen. PT sta