Histology; normal and morbid.
- Dunham, Edward K. (Edward Kellogg), 1860-1922
- Date:
- 1898
Licence: Public Domain Mark
Credit: Histology; normal and morbid. Source: Wellcome Collection.
Provider: This material has been provided by the Augustus C. Long Health Sciences Library at Columbia University and Columbia University Libraries/Information Services, through the Medical Heritage Library. The original may be consulted at the the Augustus C. Long Health Sciences Library at Columbia University and Columbia University.
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![Endotheliomata, on the other haud^ spring from the connective tis- sue;;, often at a point remote from any epithelial structures; e. g., the dura mater. When the endothelioma owes its origin to a proliferation of the flat cells lining the lymph-spaces or vessels it has a plexiform struct- ure, the young cells occupying pre-existent interstices in the tissues or following the arrangement of the vessels (Figs. 318 and 319). As the cells grow older they may become flattened, and are then Fig. 318. Endothelioma from the floor of the mouth. (Barth.) Older portion of the growth. This has a general alveolar structure, the alveoli being separated by a vascularized areolar tissue, n, n, necrosed groups of endothelial cells; h, h, similar necrosed masses that have undergone hyaline degeneration. often imbricated, forming little, pearl-like bodies. These may subsequently undergo degenerative changes, such as hyaline degen- eration, which convert them into homogeneous masses or bands. Where this takes place the tumor has received the name, cylin- droma. Or the degenerated cells may })e the scat of calcareous infil- tration. This is the origin of the ])samm()mata or saud-tumors of the cerebral membranes (Fig. 320). In other cases the cells may not acquire the membranous character of adult endotlielium, but continue to multiply witliout such specialization. Tlien the tumor partakes of the sarcomatous nature of the other connective-tissue tumors of higlily cellular structure and devoid of any marked](https://iiif.wellcomecollection.org/image/b21223841_0352.jp2/full/800%2C/0/default.jpg)
