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Tumors
Benign and Malignant Tumors
| Question | Answer |
|---|---|
| Benign - Mode of Growth | Relatively slow growth by expansion; encapsulated; cells adhere to each other |
| Malignant - Mode of Growth | Rapid growth; invades surrounding tissue by infilteration |
| Benign - Cells under microscopic examination | Resemble tissue of origin; well differentiated; appear normal |
| Malignant - Cells under microscopic examination | Do not resemble tissue of origin; vary in size and shape; abnormal appearance and function |
| Benign - Spread | Remains localized |
| Malignant - Spread | Metastasis; cancer cells carried by blood and lymphatics to one or more other locations; secondary tumors occur |
| Benign - Other properties | No tissue destruction; not prone to hemorrhage; may be smooth and freely movable |
| Malignant - Other properties | Ulceration and/or necrosis; prone to hemorrhage; irregular and less movable |
| Benign - Recurrence | Rare after excision |
| Malignant - Recurrence | A common characteristic |
| Benign - Pathogenesis | Symptoms related to location with obstruction and/or compression of surrounding tissue or organs; usually not life-threatening unless inaccessible |
| Malignant - Pathogenesis | Cachexia; pain; fatal if not controlled |