9%20ECOGRAFIA%20ABDOMINAL%20COMO%20CUANDO%20DONDE

PATHOLOGY OF THE LIVER AND PORTAL VENOUS SYSTEM 101
+34.9MM
NORMAL
1442 HZ
C
E
Figure 4.21 cont’d (C) Balanced PV flow. Alternate
forward and reverse low-velocity flow on the Doppler
spectrum. The PV colour Doppler alternates red and blue.
(D) PV thrombosis. The PV is dilated (arrows) and filled
with thrombus. A collateral vessel is seen anterior to
this—not to be confused with the PV—as this is a source
of false-negative ultrasound results. (E) Non-dilated,
thrombosed PV (arrow) with collaterals demonstrated on
power Doppler.
D
other causes, including inflammatory or
malignant conditions which may surround,
compress or invade the portal and/or splenic
veins (Box 4.1). The thrombosis may be total
or partial.
● hepatopetal main PV flow with hepatofugal
peripheral flow may be a sign of HCC,
requiring careful scanning to identify the
lesion.
● cavernous transformation. A network of
collateral vessels may form around a
thrombosed main portal vein at the porta,
especially if the thrombosis is due
to extrahepatic causes (for example