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Classification of lymph node (LN) metastasis. (a): Common type, (b): Direct type, (c): Scatter type, (d): Isolated tumor cell (ITC). Common-type metastasis was noted in 55% positive LNs of 75% node-positive patients; direct type in 36% LNs of 69% patients; scatter type in 5% LNs of 14% patients; and ITCs in 5% LNs of 18% patients.
