DOI:10.2214/AJR.07.3485
AJR 2008; 191:794-801
© American Roentgen Ray Society
Laparoscopic Cholecystectomy: Postoperative Imaging
Peter D. Thurley1 and
Rajpal Dhingsa
1 Both authors: Department of Radiology, Nottingham University Hospitals, Queens
Medical Centre, Derby Rd., Nottingham, NG7 2UH, United Kingdom.
Received December 2, 2007;
accepted after revision March 14, 2008.
Address correspondence to P. D. Thurley
(pthurley{at}doctors.org.uk).
CME
This article is available for CME credit.
See
www.arrs.org
for more information.
Abstract
OBJECTIVE. The purpose of this article is to describe the imaging
findings after laparoscopic cholecystectomy, including the normal
postoperative findings and the typical appearances of major complications. The
relative merits of the imaging techniques available are discussed.
CONCLUSION. Laparoscopic cholecystectomy is a commonly performed
surgical procedure and radiologists are often called on to identify or rule
out postoperative complications. In such cases, the correct diagnosis is
crucial in optimizing patient management.
Keywords: cholelithiasis complications laparoscopic cholecystectomy normal findings
Introduction
Laparoscopic cholecystectomy was first developed in Europe in the mid 1980s
as an alternative to open cholecystectomy, a procedure that had been performed
for more than a century. It has rapidly gained widespread popularity to become
the procedure of choice for patients with symp tomatic cholelithiasis
[1]. Laparoscopic
cholecystectomy has advantages over open cholecystectomy, including a shorter
hospital stay and an earlier return to normal activities
[2]. However, complications
after laparo scopic proce dures, especially bile duct injuries, have been
reported to be more common [3],
especially in the hands of less experienced surgeons
[4]. A variety of other
problems, including vascular injury, retained gallstones, and abscess
formation, may also be encountered after laparoscopic cholecystectomy
[3,
5–11]
(Table 1).
The correct use of radiologic tests can establish the type and site of
postoperative complications, allowing timely intervention
[12]. Sonography, CT, ERCP, MR
cholangiopancreatography (MRCP), and radionuclide imaging all have a role to
play in evaluating the postoperative patient
[13,
14]. These investigations are
often complementary and the primary imaging technique to be used will vary
depending on the clinical problem faced. It is therefore important that radiol
ogists are aware of the relative benefits of each investigation.
The aim of this article is to show the spectrum of imaging findings after
laparoscopic chole cyst ectomy and provide examples of complications and
normal findings. We also discuss the advan tages and disadvantages of the
available radiologic investigations.
Normal Appearances After Laparoscopic Cholecystectomy
Recognizing complications after laparoscopic cholecystectomy as soon as
possible is advantageous because doing so allows prompt intervention and in
turn may lead to an improved patient outcome
[15]. To achieve this, a low
threshold for requesting imaging studies is necessary, which is likely to
result in many imaging studies that simply show the normal sequelae of
laparoscopic cholecystectomy. The significance of imaging findings may vary
considerably depending on the clinical findings; and it is important, as
always, to interpret the imaging in the context of the patient's history,
examination, and other test results.
Imaging studies may be required to look for evidence of biloma, abscess
collections, or hematomas. However, not all fluid collections require
intervention. A small amount of fluid in the surgical bed is commonly seen
postoperatively on sono graphy
[16], which in isolation does
not justify percutaneous drainage. A small series that examined the CT
appearances in un complicated laparoscopic cholecystectomy in six patients
also found that 3–5 days after surgery fluid-density material is often
seen in the gallbladder fossa (Fig.
1A,
1B). Small amounts of free
pelvic fluid and increased density in the abdominal wall fat at the site of
the laparoscopic ports were also often present
[17].

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Fig. 1A —Normal appearances after cholecystectomy. CT scan of
53-year-old woman 2 days after laparoscopic cholecystectomy shows collection
measuring 21 HU (consistent with fluid) is present within gallbladder fossa
(arrow) adjacent to cholecystectomy clip. This is commonly seen after
uncomplicated laparoscopic cholecystectomy.
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Fig. 1B —Normal appearances after cholecystectomy. CT scan of
62-year-old woman with abdominal pain and pyrexia after laparoscopic
cholecystectomy shows mixed gas–fluid attenuation in gallbladder fossa,
consistent with Surgicel (oxidized regenerated cellulose, Johnson &
Johnson Ethicon) (arrow). Review of surgical notes confirmed that
Surgicel had been used in gallbladder bed. Patient's symptoms settled without
intervention.
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Biliary dilatation may be seen postoperatively due to obstruction from
retained stones or accidental clipping of bile ducts. However, after
laparoscopic cholecystectomy, bile duct dilatation has also been described in
the absence of obstruction
[18]. Furthermore, patients
with cholelithiasis may have had bile duct calculi preoperatively, and the
resulting biliary dilatation may persist despite relief of the obstruction
[19]. These factors should be
considered when assessing the postoperative patient with dilated bile ducts,
and correlation with biochemical and clinical features is important before
considering further investigation.
Another potential pitfall is the use of hemostatic agents in the
gallbladder bed (Fig. 1A,
1B). Surgicel (oxidized
regenerated cellu lose, Johnson & Johnson Ethicon) is a bio absorbable
hemostatic agent with bactericidal properties that is used in laparoscopic
cholecystectomy and other surgical procedures to control hemorrhage. When
imaging is performed on postoperative patients, the appearances of Surgicel
can mimic those of hematoma
[20], abscess
[21,
22], or even tumor
[23], although Surgicel can
usually be differentiated from a retained surgical swab because of the
radiopaque marker incorporated into the latter
[24]. Failure to correctly
identify Surgicel can result in patients undergoing un necessary surgery
[25].

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Fig. 2 —T2-weighted MR image of 16-year-old girl with abdominal pain,
elevated inflammatory markers, and pyrexia 2 months after laparoscopic
cholecystectomy. Note fluid collection in gallbladder fossa
(arrowhead); area of signal void anterior (arrow) to
collection represents air. Patient was treated for infected collection with
antibiotics, and MRI 6 months later showed resolution of changes.
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The CT appearance of Surgicel is similar to that of an infected
hematoma—that is, a mass of 40–55 HU containing foci of air
[26]. Similar problems are
encountered using sonography, on which the Surgicel appears as an echogenic
mass with posterior reverberation artifact. These sonographic ap pearances
would be accounted for by a gas-containing abscess
[27]. MRI can be useful in
differentiating between abscess (Fig.
2) and Surgicel because of the low signal on T2-weighted images of
the latter, possibly secondary to the imaging characteristics of blood
degradation products [28].
Although this might prove to be a useful problem-solving tool, good
communication between surgeons and radiologists and correlation between
imaging findings and the clinical history, examination, and operative findings
are essential.

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Fig. 3A —Bile duct injuries. 42-year-old woman with abdominal pain,
pyrexia, and leukocytosis 10 days after laparoscopic cholecystectomy. CT scan
(A) shows Surgicel (oxidized regenerated cellulose, Johnson &
Johnson Ethicon) in gallbladder fossa (thin arrow, A) and
small fluid collection adjacent to tip of liver (thick arrow,
A). Patient underwent laparotomy, which showed leak from common bile
duct (CBD), which was sutured. Patient remained unwell and underwent ERCP
(B), which showed persistent leak from damaged CBD (arrow,
B). Leak resolved after endoscopic placement of a stent.
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Fig. 3B —Bile duct injuries. 42-year-old woman with abdominal pain,
pyrexia, and leukocytosis 10 days after laparoscopic cholecystectomy. CT scan
(A) shows Surgicel (oxidized regenerated cellulose, Johnson &
Johnson Ethicon) in gallbladder fossa (thin arrow, A) and
small fluid collection adjacent to tip of liver (thick arrow,
A). Patient underwent laparotomy, which showed leak from common bile
duct (CBD), which was sutured. Patient remained unwell and underwent ERCP
(B), which showed persistent leak from damaged CBD (arrow,
B). Leak resolved after endoscopic placement of a stent.
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Fig. 3C —Bile duct injuries. Image from ERCP in 31-year-old woman.
Clips have been placed across CBD (thin arrow), and free contrast
material (thick arrow) is visible because of duct injury. Patient was
treated with hepatojejunostomy.
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Biliary Complications
Biliary complications are more common after laparoscopic than after open
cholecystectomy [29] and
include bile duct damage, biliary obstruction, and dropped stones.
Bile Duct Injury
Injury to the bile ducts often goes unrecognized at the time of surgery
[30]. There should be a high
level of suspicion when patients are referred with symptoms of abdom inal
pain, sepsis, or jaundice soon after laparoscopic cholecystectomy
[31]. The reported rate of
bile duct injury after laparoscopic cholecystectomy varies among different
series; however, a review of 5,913 cases over a 5-year period showed a 0.6%
overall rate of bile duct injury, with the rate for individual surgeons
ranging from 0.4% to 4%
[9].

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Fig. 4C —56-year-old woman with abdominal pain following laparoscopic
cholecystectomy. Subsequent ERCP shows stent that has been deployed
endoscopically in common bile duct across origin of cystic duct.
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Initial assessment in patients with suspected bile duct injury is usually
with sonography or CT [32].
These investigations may show perihepatic fluid collections (Figs.
3A,
3B,
3C and
4A,
4B,
4C), although the absence of
these does not exclude injury
[33]. Free intraperitoneal
fluid may also be seen, although this is a nonspecific finding in a
postoperative patient [34].
Hepatobiliary scintigraphy is a less commonly used non invasive method of
evaluating patients with suspected bile duct injury that has two potential
advantages over sonography and CT. First, it has been claimed to be more
sensitive and specific than sonography or CT in detecting bile leaks
[35]. Second, as well as
confirming a bile leak, hepatobiliary scintigraphy may identify the
relationship between the leak and the collection
[36] and show the primary
route of bile flow [35].
Despite this, it may be necessary to complement scintigraphy with other
investigations such as ERCP to fully appreciate the degree of bile duct injury
[37].
Although it is an invasive procedure, ERCP is useful in patients in whom
there is a strong suspicion of bile duct injury (Fig.
3A,
3B,
3C). As well as being able to
show the exact site of injury or leak, ERCP can sometimes be used to
successfully treat the leak using internal stents (Fig.
4A,
4B,
4C). Success using this
technique may be more likely if the injury to the duct is < 5 mm, the
injury is extrahepatic, and there is no associated abscess or biloma
[38]. Open surgery is the main
alternative to ERCP in cases of persistent leaks; some authors have
recommended ERCP as the first-line treatment for such patients in an effort to
avoid the increased morbidity associated with open surgery
[34].
MRCP is an alternative way of assessing the anatomy of bile ducts. The use
of mangafodipir trisodium, a contrast agent that is primarily excreted via
bile, makes it possible to both diagnose a bile leak and identify the source
of the leak [39,
40]. The advantages of this
technique are that it is noninvasive and does not use ionizing radiation;
however it has limitations, including poor opacification of bile ducts in the
presence of obstruction and unreliable depiction of the more peripheral
intrahepatic bile ducts
[39].
Biliary Obstruction
Causes of biliary obstruction include retain ed gallstones (Fig.
5A,
5B,
5C), misplaced surgical clips,
fibrosis secondary to in flammation from adjacent clips, and thermal injury
from cautery devices [38].
Although typically obstruction at the level of the common bile duct produces
intrahepatic duct dilatation in both lobes
[41], dilatation in a single
lobe, most commonly the left (Fig.
6A,
6B), may also occur
[42]. As discussed previously,
the presence of dilated ducts alone is not diagnostic of biliary obstruction.
Stones may be identified on sonography if good views of the biliary tree can
be obtained or on CT if the stones are of a differing density from bile. If CT
or sonography does not clearly delineate a cause for the obstruction, MRCP can
identify stones as small as 2 mm that are retained in the biliary tree
[43]. Identification of these
stones allows planning of management strategies for patients who may require
inter vention with ERCP. Alternatively, if imaging shows no obstruction or
retained stones, ERCP, which is an invasive and potentially harmful
investigation [44], can be
avoided.

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Fig. 5A —56-year-old woman with abdominal pain 3 months after
laparoscopic cholecystectomy. Axial CT image shows low-attenuation change in
pancreas (arrow) and peripancreatic fluid, in keeping with
pancreatitis.
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Fig. 5B —56-year-old woman with abdominal pain 3 months after
laparoscopic cholecystectomy. MRCP shows filling defects in common bile duct
(CBD) (arrows) and normal-caliber pancreatic duct
(arrowheads).
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Fig. 6B —72-year-old man with abdominal pain and abnormal liver
biochemistry following laparoscopic cholecystectomy. ERCP shows filling
defects in common bile duct that are consistent with retained stones.
Gallstones were subsequently removed endoscopically.
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Intraoperative cholangiography (IOC) can allow surgeons to identify stones
in the bile ducts (Fig. 7) and
also help to correctly identify the anatomy of the biliary tree, thereby
preventing division of structures other than the cystic duct
[45]. The role of IOC is
controversial, with some surgeons advocating its use in all patients
undergoing laparoscopic cholecystectomy and others reserving IOC for patients
with a high risk of bile duct injury—such as patients with atypical
anatomy—or retained gallstones
[46]. It has been shown that,
even if IOC is performed, bile duct injury may go undiagnosed at the time of
surgery. In a study of 64 patients who had sustained a bile duct injury at
laparoscopic cholecystectomy 39 underwent IOC. Of those 39, the injury was
recognized in only 33% at the time of the operation. In retrospect, a further
29% had evidence of bile duct injury on IOC images
[47]. The failure to correctly
identify abnormalities on IOC has previously been highlighted as a problematic
area. An editorial reviewing ways of minimizing complications of laparoscopic
surgery suggested that unless a surgeon is competent at recognizing gross
changes on cholangio graphy, he or she should not perform laparo scopic
cholecystectomies [48].
However, as previously stated, opinion is divided, with some authors claiming
there is no evidence that IOC prevents injury and is an additional burden in
terms of both time and money
[49].
Dropped Gallstones
Spillage of gallstones occurs commonly during laparoscopic cholecystectomy,
with a reported incidence of 0.1–20%
[50]. Fortunately, most of
these stones do not cause symptoms
[46], although if spillage
does occur every effort should be made to retrieve the stones in view of the
small risk of developing important complications
[51]. The most common
complication reported in the literature is abscess, either in the abdominal
wall or in the peritoneum
[52]. Retained gallstones have
also presented after erosion through the skin
[53], as a colovesical fistula
[54], with expectoration of
stones (cholelithoptysis)
[55], and as the cause of an
incarcerated hernia [56].
Dropped gallstones leading to abscess formation can occur after a period of
months to years after the laparoscopic cholecystectomy, which can make
diagnosis challenging [57].
Spilled gallstones appear on sonography as small hyperechoic lesions that may
be related to fluid collections and are found most often in the
subdiaphragmatic or subhepatic spaces
[58] (Fig.
8A,
8B). If they are calcified,
gallstones may also be visible on CT as hyperdense areas or on T1-weighted MRI
as a signal void [59].
Vascular Complications
Vascular injuries during laparoscopic cholecystectomy most commonly occur
in the surgical bed or the abdominal wall and are related to trocar insertion
[46]. A review of 14,243
laparoscopic procedures showed an overall hemorrhage rate of 4.1%, with
bleeding rates of 2.3% intraoperatively and 1.8% postoperatively
[60], although the reported
incidence varies among series
[5,
7,
8,
10,
11].
Trocar insertion at the beginning of a laparo scopic procedure may cause
bleeding because of small vessels in the abdominal wall, most commonly the
inferior epi gastric vessels
[61] or mesentery
[62], or larger vessels such
as the inferior vena cava and aorta
[63]. Abdominal wall and intra
peri ton eal hematomas can be readily visualized on CT as areas of higher
atten uation. On sonography, hema tomas appear as heterogeneous fluid
collections [64].
During the dissection of structures in the gallbladder bed, the right
hepatic artery is the vessel most commonly injured, followed by the portal
vein [65]. Life-threatening
bleeding can occur from the gallbladder bed without obvious major vessel
injury, especially in patients with preexisting liver disease such as
steatosis hepatis, hepatic siderosis, and chronic or recurrent cholecystitis
[66]. Hepatic artery
pseudoaneurysm formation (Fig.
9A,
9B,
9C,
9D) has also been described
after laparoscopic cholecystectomy and may be related to bile leak and
subsequent infection [67]. If
this occurs, contrast-enhanced CT may show a hematoma or directly show the
pseudoaneurysm. Imaging with selective angiography of the celiac and superior
mesenteric arteries is helpful in confirming the diagnosis
[68] and facilitates
subsequent endovascular treatment.

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Fig. 9A —41-year-old woman 3 weeks after laparoscopic cholecystectomy.
Patient presented with abdominal pain. (Courtesy of R. O'Neill, Nottingham
University Hospitals.) CT scans show area of hyperdensity representing
contrast material (arrow) and associated area of mixed attenuation
suspected to be a hematoma. This raised possibility of hemorrhage from a
pseudoaneurysm. Note adjacent surgical clip (arrowhead).
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Fig. 9B —41-year-old woman 3 weeks after laparoscopic cholecystectomy.
Patient presented with abdominal pain. (Courtesy of R. O'Neill, Nottingham
University Hospitals.) CT scans show area of hyperdensity representing
contrast material (arrow) and associated area of mixed attenuation
suspected to be a hematoma. This raised possibility of hemorrhage from a
pseudoaneurysm. Note adjacent surgical clip (arrowhead).
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Fig. 9C —41-year-old woman 3 weeks after laparoscopic cholecystectomy.
Patient presented with abdominal pain. (Courtesy of R. O'Neill, Nottingham
University Hospitals.) Diagnosis of hepatic artery pseudoaneurysm
(arrow, D) was confirmed with selective angiography of celiac
axis. Note adjacent surgical clip (arrowhead, D).
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Fig. 9D —41-year-old woman 3 weeks after laparoscopic cholecystectomy.
Patient presented with abdominal pain. (Courtesy of R. O'Neill, Nottingham
University Hospitals.) Diagnosis of hepatic artery pseudoaneurysm
(arrow, D) was confirmed with selective angiography of celiac
axis. Note adjacent surgical clip (arrowhead, D).
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Other Complications
Several less common complications of laparoscopic cholecystectomy have been
reported that may be diagnosed radiologically. The incidence of port site
hernia after laparoscopic surgery (Fig.
10) is estimated to be 0.02–3.6%
[69] and may cause small-bowel
obstruction. Although hernias are often suspected clinically because of a
palpable lump at a port site, the diagnosis can be confirmed using CT
[70]. Diaphragmatic hernias
are more rare and can also be diagnosed with the aid of CT by revealing a
defect in the diaphragm or herniation of peritoneal fat into the chest
[71]. In addition, cases of
portal vein thrombosis diagnosed on sonography
[72], splenic rupture
diagnosed on CT [73],
intestinal ischemia [74], and
delayed bowel perforation due to thermal injury
[75] have all been reported
after laparoscopic cholecystectomy.

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Fig. 10 —Axial CT image of 61-year-old woman with clinical features of
small-bowel obstruction 3 days after cholecystectomy. Note fluid-filled loops
of small bowel (arrowhead) proximal to hernia (arrow) at
site of laparoscopy port.
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Summary
Laparoscopic cholecystectomy has an overall complication rate of
approximately 3% [31]. Because
of the large numbers of laparoscopic cholecystectomies being performed, it is
not rare for patients to be referred for imaging investigations post
operatively. In view of this, it is essential that radiologists and surgeons
are aware of potential complications that may arise and their imaging
appearances. Of equal importance is the recognition of normal findings after
laparoscopic cholecystectomy to avoid mis interpretation. Failure to recognize
these findings puts patients at risk of undergoing unnecessary and invasive
procedures.
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