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Pattern of partial high-signal intensity involving less than 50% of the node on SPIO-enhanced MR imaging. (a) The node showed high-signal intensity before administration of superparamagnetic iron oxide (SPIO). (b) After administration of SPIO, the node showed partial high-signal intensity involving less than 50% and was diagnosed as malignant (arrow). (c) Histological findings showed the presence of micro-metastases within the node (arrowheads).
