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

46
ABDOMINAL ULTRASOUND
A
B
Figure 3.9 (A) A stone in a dilated common bile duct (CBD) with posterior shadowing. The gallbladder was dilated
but did not contain stones. (B) Stone formation in the intrahepatic ducts.
A
B
Figure 3.10 (A) Small stone in the CBD causing intermittent obstruction. At the time of scanning, the CBD was
normal in calibre at 5 mm. The duct walls are irregular, consistent with cholangitis. (B) Endoscopic
cholangiopancreatography (ERCP) of a stone in a normal-calibre (5 mm) duct.
with ultrasound should always be made, even if it
is of normal calibre at the porta (Fig. 3.10).
Other ultrasound signs to look for are shown in
Table 3.2.
Possible complications of gallstones are outlined
in Figure 3.11A. In rare cases, stones may perforate
the inflamed gallbladder wall to form a fistula
into the small intestine or colon. A large stone