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Fig. 2B. Drawings show schema of sonographic findings. Arrow at bottom
of drawings shows scanning from proximal side to center of tumor. Drawing of
sonogram shows circular lesion and circumferential thickening of bile duct by
tumor (right). At center of tumor (T), width of lesion (distance between probe
and outer margin of tumor, B) is thicker than width of bile duct (BD) wall
(inner hypoechoic layer, A) of proximal side. left = proximal side of tumor,
right = center of tumor.
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