210 



CYLINDROMA. 



resulting from tlieir proliferation ; anil the cords naturally ramify 

 and anastomose Avitli one another like the lymphatics themselves. 

 Thereupon, the hyaline degeneration sets in, beginning in the 

 axis of the -cords. It may even be demonstrated in individual 

 cells ; at a later period, however, the products of degeneration 

 coalesce to form those larger globes and cylinders whose original 

 cellular composition is at best but faintly indicated by the 

 presence and stellate arrangement of a finely- granular material 

 coinciding with the intercellular limits. The hyaline degenera- 

 tion may implicate the whole of the epithelial coat, a hyaline 

 cylinder of relatively large size appearing to be. embedded in the 

 connective tissue of the stroma. 



The presence of blood-vessels in the axis of the hyaline 

 cylinders, which I have succeeded in 

 demonstrating in a tumour extending 

 to the cerebral substance (fig. QS), 

 is explained by Kbster by the well= 

 known perivascular disposition of the 

 lymphatic sinuses. 



Cylindroma is very liable to recur 

 after removal, but it seldom gives rise 

 to metastatic deposits; accordingly it 

 deserves a place near the carcinomata. 

 To distino^uish it from the glandular 

 and epithelial forms of cancer, it may 

 be allowed to retain the name of can- 

 croid, which used formerly to be ap- 

 plied to all the varieties of epithelial cancer indiscriminately. 



Cylindroma from the cortex 

 cerebelli. 



