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Pathology · Neoplasia: metastasis
Sample itemWhich property most directly distinguishes a malignant neoplasm from a benign neoplasm?
Original practice item, not a recalled exam question. Nothing here is recorded.
The answer and the reasoning
D. Ability to invade and metastasize
Malignant tumors can invade locally and metastasize to distant sites, whereas benign tumors do not metastasize. Size, pain, and mitoses alone are not definitive criteria.
Option by option
A. Large size alone
Large tumors can still be benign.
B. Presence of any mitotic figures
Some benign tumors have mitotic activity.
C. Pain at presentation
Pain depends on location and does not classify behavior.
D. Ability to invade and metastasize (correct)
Correct. Invasion and metastasis define malignant biologic behavior.
Source note: Original NextPrep sample item — pending expert review. This item is original practice material awaiting independent expert review, so confirm important facts in a standard textbook.
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