TUMORS. 



'.// 



An alkaline secretion at points where exposure and irritation 

 occurs produces carcinomata (llertzler). Folhjwing- this thought 

 an acid reaction in a normally alkaline tissue would tend to pro- 

 duce sarcomatous tissue. 



The specific causative factor of tumor formation is not known. 

 but it is something that excessiveh- stimulates the reproductive 

 power of cells. In fact, all other functions practicalh cease, the 

 entire cell energy being expended in rei)roduction. That is. 

 tumors are the result of a disturbance in the cell metaliolism in 

 which rejiroduction is far in excess of the physiologic limit anrl 

 is exercised at the expense of all other fimctions. 



Varieties. — There is no satisfactory metliod of classifying 

 tumors. Some authors have attempted methods of classifying, 

 but until more is known concerning them a classification is un- 

 wise. Tlie following is an attempt at grouping them, but is in 

 no wa^■ complete. Thev mav be griaiped as to: 



OCCURRENCE. 



Primary — The original or first fuinor. 



Secondary — Metastatic tumor. 



Recurrent — A neioly derelopcd tumor at tlic j^oiiit from which 

 one Ims In-cii recciitly removed. 

 STRUCTURE. 



Histoid — Simple tissue tumor. 



( >ro'inoid — Orcian-lil^'c tumor. 



Teratoid — Mi.vtnre of 'oarious tissues resulting iu a structure re- 

 sembling an emhryo. 

 CLINIC A LEY. 



Beuigu — A'() teudeucy to l^iH. 



Malign — Ha-ciug a tendency to hiU. 



The following scheme shows the general structure and rela- 

 tion of the various tumors: 



f Adult Ti.ssue 



Tumors- 



Connective 



Epithelium 

 Muscular-myom 



Myxoma. Cliondroma 

 Osteoma, odontoma, • 



Lipoma, Glioma 



Fibroma | papnioma 



Vescular-anRi(im;i 



fLeiomyiima 

 ''' i Rhabdomyoma 



f Lymphangioma 



l Hemangioma 



^ Embryonic Tissue 



Nervous-neuroma 



( Round Cell ■ ^ 

 \ Spindle Cell | 

 Connective-Sarcoma \ Myeloid Cell 



( Endothelioma r PJ'icentoma 



Eidthelium 



Carcnioma • 

 .\denoma ■ • 

 Epithelioma 



Hypernepliroma 



