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

200
ABDOMINAL ULTRASOUND
The most common anomaly of the IVC is that
of duplication. However this is infrequently picked
up on ultrasound and is best demonstrated with
CT or MRI. Transposition of the IVC may be seen
in situs inversus.
Pathology of the IVC
Thrombus in the IVC may be due to benign
causes, or the result of tumour. It is not usually
possible to tell the difference on grey-scale appearances
alone, but vascularity may be demonstrated
on power or colour Doppler within tumour
thrombus, and the clinical history is helpful.
Tumour thrombus invades the renal vein and
A
D
B
C
E
Figure 8.4 (A) LS through the IVC. The RRA is seen passing underneath the IVC. (B) TS through the IVC, demonstrating the
difference in profile during the Valsalva manoeuvre (left) compared with normal expiration (right). (C) IVC at the level of
the confluence of the hepatic veins, just beneath the diaphragm. (D) Power Doppler of the IVC overcomes problems associated
with its perpendicular angle to the transducer. Portal vein (PV) anterior to IVC. (E) The right renal vein (RRV) (in red) is seen
draining into the IVC on colour Doppler.
(Continued)