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STUDY OF TUMOES. 
Cause; 
External irritation. (Virchow.) 
Defective development — embryonal rests. (Cohnheim. ) 
Infectious character — parasitic theory. Cell inclusions. 
Constitutional discrasia. 
Loss of compensation between cellular destruction and proliferation. 
Classification : 
Histogenetic— based on structure. 
Embryologic — based on embryologic derivation of tissue forming the tumor. 
Clinical — benign, malignant. 
Metastasis. 
Cut sections and study the following, which will be found in the laboratory collection 
1. Myoma. 
2. Neuroma. 
3. Angioma: 
а. Simple. 
б. Cavernous. 
4. Lymphangioma: 
а. Simple. 
б. Cavernous. 
5. Eibroma. 
Soft fibroma. 
Hard fibroma. 
Intracanalicular fibroma — of breast. 
6. Myxoma. 
7. Lipoma. 
8. Chondroma. 
9. Osteoma. 
10. Glioma. 
11. Sarcoma: 
a. Round celled. 
h. Lympho-sarcoma. 
c. Alveolar. 
d. Spindle celled. 
e. Melano-sarcoma. 
/. Osteoid. 
g. Psammoma. 
h. Myeloid. 
i. Angiosarcoma. 
j. Endothelioma. 
12. Papilloma. 
13. Adenoma. ' ^ 
14. Carcinoma; 
а. Acinous. 
б. Epithelioma. 
15. Cystoma. 
16. Hypernephroma. 
