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FIG 1. Images from the case of an 83-year-old woman with upper gingival cancer.
A, Contrast-enhanced axial CT scan shows reactive node (arrow; short-axis diameter, 4 mm) in level I.
B, Gray scale sonogram of the same node as that shown in A shows reactive node exhibiting normal hilar echogenicity (arrows).
C, Doppler sonogram shows blood flow signals (arrow) overlapping hilar echogenicity.
D, Contrast-enhanced axial CT scan, obtained 10 months after the examinations that produced negative results (shown in A–C), shows metastatic node (arrow; short-axis diameter, 8 mm) exhibiting central nodal necrosis.
E, Gray scale sonogram of the same node as that shown in D shows metastatic node without hilar echogenicity.
F, Doppler sonogram shows abnormal blood flow signals in periphery (arrows). No hilar blood flow signal intensity is seen.
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