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Diagnostic ultrasound ( PDFDrive )

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CHAPTER 6 The Biliary Tree and Gallbladder 191

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D E F

FIG. 6.30 Secondary Findings in Hilar Cholangiocarcinoma. (A) Difference in lobar echogenicity. The right lobe of the liver is demarcated

from the left by its increased echogenicity. The right biliary system was obstructed by tumor centrally. (B) Compensatory increased low in

hepatic arteries. Enlarged hepatic arterial branches (arrows) on either side of the ascending branch of the left portal vein are clearly seen, whereas

no low is noted in the portal vein. This inding suggests severe stenosis or obstruction of the portal vein. (C) and (D) Lobar atrophy. Marked

atrophy of the right lobe with compensatory hypertrophy of the left lobe (*). Enlarged medial segment of the left lobe. (E) and (F) Lobar atrophy.

Marked atrophy of the left lobe of the liver. Besides the small size, widening of the issure for ligamentum venosum (arrows) and concave liver

margins are secondary clues. (F) Axial SSFSE T2-weighted MRI shows the same.

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B

FIG. 6.31 Cholangiocarcinoma: Conventional Versus Contrast Evaluation. (A) Routine gray-scale image demonstrates dilated ducts terminating

abruptly. The tumor is not visible. (B) Contrast-enhanced image obtained in the postvascular phase clearly depicts the margins of the unenhancing

tumor.

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