The difference between a benign and a malignant tumor is that malignant tumors:
1. May recur after treatment, may occur in other tissues, and have an irregular shape.
2. Rarely recur after treatment, remain localized, and have a regular shape.
3. May recur after treatment, are well differentiated, and have an irregular shape.
4. Rarely recur after treatment, stay localized, and have moderate irregularity.
May recur after treatment, may occur in other tissues, and have an irregular shape.
Rationale: Benign tumors are usually slow growing, are expansive, are localized or encapsulated, have a fibrous capsule, rarely recur after removal, are usually regular in shape, are well differentiated, and have slight vascularity. Malignant tumors may proliferate rapidly or grow slowly, have infiltrative patterns, metastasize throughout the body and invade nearby tissue, have no enclosing capsule, may recur even after treatment, have an irregular shape with a poorly defined border, are poorly differentiated, and have moderate to significant vascularity.
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