The coronal T1-(A) and T2-weighted (B) MR images obtained before injecting gadopentetate dimeglumine show enlarged parotid lymph nodes (arrow). The coronal T1-weighted MR images obtained before (C) and after (D) injecting gadopentetate dimeglumine 3 weeks after tumor cell inoculation show enlarged parotid lymph nodes (arrow) with rim enhancement. The photomicrograph (E) shows a metastatic parotid lymph node with central necrosis (H & E stain; original magnification, ×2).
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