Can a surgeon tell if a tumor is cancerous by looking at it?

Related questions

1. How fast do malignant tumors grow?
2. Can MRI tell if tumor is cancerous?
3. Is Stage 4 throat cancer a terminal?
4. Can a CT scan tell if a tumor is cancerous?
5. What is the difference between a tumor and a mass?
6. Can you tell if a tumor is cancerous from an MRI?
7. What are the different stages of cancer?
8. Does biopsy cause cancer to spread?
9. Does heterogeneous mass mean cancer?
10. What causes cancer to spread fast?

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19. #tumor
20. #surgery
21. #doctor
22. #additional
23. #allowing
24. #stage