Biliary tract

2. Bileis a bi-product of degraded hemepart of
old red cells.
It is secreted by the liver ,transported through
biliary channelsto gall bladder where it is
stored, concentrated and later delivered to the
duodenum.

3. ANATOMY OF BILIARY TREE
Biliary tree is dividedinto:
Intrahepatic ducts
Extrahepatic ducts
INTRAHEPATIC DUCTS
These comprise of ductularand canalicularnetwork
from the acini . The smallest interlobular ducts join to
form segmental bile ducts which finally unite to form
the left and right hepatic ducts.
They travel with branches of portal vein & hepatic
artery in portal triads.

4. The Rt.hepaticductdrains four segments of
Rt.lobeof liver through two segmental divisions
,an anterior division drains segment 5 & 8 and
posterior division drains segment 6 & 7.
TheLt.Hepaticductdrains segment 2,3 & 4 of
left lobe.
Caudate lobe has a variable drainage pattern
but in majority, 78% drainage is into both main
ducts.

5. EXTRA HEPATIC BILE DUCTS
 The right and left hepatic ducts fuse at the
hilum ,anterior to bifurcation of the portal vein to
form Common Hepatic Ductwhich is then inserted
by cystic duct from the gall bladder and becomes
Common Bile Duct
 The CBDpasses inferiorly posterior to the first
part of duodenum and pancreatic head to enter the
second part of duodenum along with the main
pancreatic duct at Ampullaof Vater

7. ARTERIAL SUPPLY
Three segments of supply.
Supply to the Supraduodenalpart is essentially axial
from Retroduodenalartery, Rt.hepaticartery, Cystic
artery and Gastroduodenalartery.
Hilar biliaryducts recruit their supply from a network
in continuity with the Supraduodenalsupply.
Retropancreaticpart of common bile duct is derived
from Retroduodenalartery.

8. DEVELOPMENTAL INTRAHEPATIC
BILIARYANOMALIES
Variations occur:
Triple confluence of the Rt.posteriorsectoral, Rt.anterior
sectoraland main Left Hepatic duct(12%)
Direct insertion of Rt.sectoralduct into main bile duct(20%)
Insertion of Rt.sectoralduct into Lt.hepaticduct(3%)
Insertion of Rt.posteriorsectoralduct into Cystic duct or gall
bladder may occur.
Failure to recognisethese anatomical variations at
cholangiography or surgery may result in biliary leaks or
impaired drainage lead to cholangitis.

9. EXTRAHEPATIC BILIARY ANOMALIES
A number of anomalies with important radiological
implications are;
Agenesis of gall bladder.
Bilobargall bladder.
Folded gall bladder.
Congenital diverticulum.
Duplication of cystic duct with a uniloculargall bladder.
Septum of gall bladder.
Anomalies of gall bladder positioni.eit may lie in an
intrahepatic, suprahepaticor retrohepaticsite or herniate
through epiploicforamen.
These anomalies if complicated by disease carry high morbidity.

10. INVESTIGATION
Radiological investigations comprise of :
Plain radiograph
Ultrasound
Computed tomography
Magnetic resonance imaging
Radionuclide imaging
Indirect cholangiography

11. PlainRadoigraph
Plain radiograph is usually taken as part of
sequence of investigation of abdominal
pain.
It gives information aboutradiopaque
stones, mural calcification, mural gas and
gas in biliary tree.

12. ULTRASOUND
the first line investigation particularly calculousdisease(over
98% accuracy).
Preperation:
Fasting for a minimum of 6 hours
Scanning in two positions,supineand left lateral ensures to find
any missed calculus.
U/S detects dilated Intrahepatic and extrahepatic ducts,
cholelithiasis, cholecystitis, GB polyp, choledochal cyst etc

13. COMPUTEDTOMOGRAPHY
The sensitivity of CT in differentiating hepatocellular
from obstructive jaundice and in determining the level
and cause of obstruction parallels that of ultrasound.
CT is reserved for those patients in whom there is
doubt as to the cause of obstruction and in staging of
biliary tumours.

14. RADIONUCLIDEIMAGING
99mTc-HIDAis used to study the action of biliary tree.
TECHNIQUE
Between 2 and 10 mCiof 99mTc-HIDA is administered intravenously after a
2 hr fast. Images are acquired over the next hour at 1min intervals.
Subsequent images may be required at various intervals over 24 hours to
evaluate excretion.
The normal HIDA scan provides functional and morphological
information about hepatic parenchyma in the first 10 min, the extrahepatic
biliary tree by 20 min, and excretion into the bile by 1 hr
INDICATIONS
Neonatal and childhood jaundice
Cholesystitis
Biliary obstruction and Biliary leaks

15. 99mTc-HIDA scan. Biliary obstruction. Activity on the serial
images is concentrated in the liver and none has traversed the
biliary tree into the gut. Cardiac activity is shown to decrease
as more and more of the
active agent is extracted by and concentrated in the liver.

16. INDIRECTCHOLANGIOGRAPHY
ORAL CHOLANGIOGRAPHY
It has a limited role in anatomical and functional
assessment of gall bladder but the diagnostic accuracy in
demonstrating gall stones is upto 90%. The media commonly
used is
sodium ipodite(Biloptin),
Calcium ipodite(Solubiloptin).

17. Small Cholesterol calculi which float in the erect
posture
(A) Prone (B) Erect

18. PERCUTANEOUS
CHOLANGIOGRAPHY(PTC)
Direct puncture of the intrahepatic ducts using a fine-
gauge Chiba needle allows demonstration of biliary tree
with relative safety.
INDICATIONS
Obstructed jaundice with or without duct dilatation.
In defining biliary-enteric or biliary-cutaneousfistulas.
In defining levels of bile leak.
To map biliary tree as a preliminary to establish external
or internal biliary drainage with stent placement.

19. ENDOSCOPICRETROGRADE
CHOLANGIOPANCREATOGRAPHY (ERCP)
ERCPis a technique that combines endoscopy and fluoroscpy
Through endoscope, inject dyes into ampullaof vaterand can
see the biliary tree and pancreatic duct
ERCP can be used both for diagnostic and therapeutic
purposes.
INDICATIONS
Obstructive jaundice
Gall stones with dilated bile ducts / Removal of stones
Sphincter of oddidysfunction / Sphincterotomy
Bile duct tumors
Dilatation of strictures

20. Risk factors involve in ERCP are:
Pancreatitis
Gut perforation
Sphincterotomyassociated bleeding.

21. OPERATIVECHOLANGIOGRAPHY
Operative cholangiography priorstarting surgical
procedure is done commonly at the time of
cholecystectomy for:
Exploration of CBD
Anomalous duct anatomy
Developmental disorders of biliary tree.
Postoperative cholangiography through a T-tubeis
indicated to ensure removal of all stones.

22. DEVELOPMENTALDISORDERSOFCHILDHOOD
 BILIARY ATRESIA
 CHOLEDOCHAL CYST
 CAROLI,S DISEASE

23. BILIARY ATRESIA
Atresia of the extrahepatic bile ducts in newborn
infants of unknown etiology.
Incidence is 0.8-1.0 /10,000 live births.
Associatedanomalies like polysplenia, situsinversus,
malrotationand absent inferior vena cava occurs in
upto 30% of cases.
Presentation is with prolonged conjugated
hyperbilirubinaemia.
u/s reveals hypoplasticgall bladder, a cystic cavity at
portaand features of cirrhosis early in life.
Treatment is early portoenterostomy.

24. Severe biliary atresia with obliteration of intrahepatic bile
ducts. Hyperplastic lymphatics allow some drainage of bile into the
constructed portoenterostomy (Kasai procedure). This is the most
common type and carries the worst prognosis.

25. Choledochalcyst
Cystic dilatation of extrahepaticbile ducts in chilldhood
Presented by;
jaundice from obstruction and cholangitis.
abdominal pain from pancreatitis.
Cholangiographyreveals a long common pancreaticobiliary
channel.
TYPES
TYPE I_ Cystic or fusiform
TYPE II_ Diverticulum
TYPE III_ Choledochoceleof intraduodenalcommon bile duct.
TYPE IV_ Extra and intrahepatic cysts.
TYPE V _ Intrahepatic dilatation.
Diagnosis is mainly by u/s and cholangiography.
Treatment is redicalexcision of cyst and hepaticojujenostomy.

26. Fusiform choledochal cyst with a
long common channel and
associated stricture at the
pancreaticobiliary junction.
CT of a large choledocal cyst
with biliary obstruction

27. CAROLI,SDISEASE
It is characterisedby multifocal, sacculardilatation of
intrahepatic bile ductssparing the extrahepatic ones.
Biliary stasis lead to cholangitis,ductalcalculi and liver
abscesses.
A specific sonographicapperanceis ”central dot”
sign, occurs when dilated bile duct segment surrounds
the adjacent hepatic artery and portal vein.
It is usually associatedwith congenital hepatic fibrosis
and cystic disease of kidneys called AUTOSOMAL
RECESSIVE FIBRO POLYSTIC DISEASE.

28. Caroli's disease with characteristic strictures and
segmental intrahepatic dilated ducts.

29. ACQUIREDDISORDERSOFCHILDHOOD
INSPISSATED BILE PLUG SYNDROME
SPONTANEOUS PERFORATION OF BILE DUCT
BILE DUCT TUMOURS
CHOLILITHIASIS
BILIARY STRICTURES
CHOLANGIOPATHIES OF CHILDHOOD

30. Inspissatedbileplugsyndrome
Infants may present with jaundice secondary to plugs
of thickened bileor rarely obstructing calculi ,and
acholicstools.
Aetiologicalfactors include prematurity, prolonged
parenteralnutrition,hemolysisdevelopmental
choledochal anomalies etc
Treatment is saline irrigation at percutaneous
cholangiography or surgical intervention.

31. Cholelithiasis
Cholelithiasis is being increasingly
diagnosed in childhood.
Phototherapy,infection,ilealresection
hemolytic diseases contribute to this rising
incident.
Spontaneous resolution is often reported
in infancy, therefore conservative
management is advisable.

32. DISORDERSOFGALLBLADDER
GALL STONES
Upto17% of adult population have gallstones. About
50% of detected calculi remain asymptomatic over a
10 year period.
Stones may be of CHOLESTEROL
PURE PIGMENT
CALCIUM BILE SALTS
MIXED

33. CALCULUSCHOLECYSTITIS
This results when a calculus obstructing the cystic duct cause
infection of static bile and the gall bladder mucosa.
Differentiated into ACUTE CHOLECYSTITIS
CHRONIC CHOLECYSTITIS
RADIOLOGICAL INVESTIGATIONS
PLAIN RADIOGRAPH
It is estimated that only 15% of gallstones are radiopaque.The
densest stones are of almost pure calcium carbonate described
as mulberry stones.They show stellatefaceted appearance
with gas forming fissures(Mercedes Benz sign)

34. Calcium carbonate(mulberry)
stones
Mercedes Benz' stone; characteristic
appearance on the plain embolisation
radiograph (arrowheads) and after
removal (insert).

35. on u/s in the acute phase;
Echogenic intraluminalfoci representing calculi
Mural thickening >3mm with a halo around.
Pericholicysticabscess formation.
Murphy,ssign, positive local tenderness.
Chronic cholecystitis results in a contracted gall bladder
sometimes with obliteration of lumen inspiteof fasting
state.

36. U/S AND CECT SHOWING TINY STONES, SLUDGEAND GALL BLADDER
WALL THICKENING AS WELL AS ECHOGENIC INFLAMATORY CHANGES
IN ADJACENT FAT

37. COMPLICATIONS OF CHOLECYSTITIS
Persistent transmuralinfection may result in a
gangrenous gall bladderthat may perforate giving rise
to either a localisedabcessor biliary peritonitus.
An empyema or mucocelemay result if there is
continuing cystic duct obstruction.
Fistulationof calculus into small or large bowel with
associated enteric obstruction is termed GALL STONE
ILEUS.
In acute cholecystitis, if local inflammatory process
involves the common hepatic or common bile duct,
condition is called MIRRIZZI SYNDROME.

38. PORCELAIN GALL BLADDER
A porcelain gallbladder is a rare disorder in
which chronic cholecystitis produces mural
calcification.
It is a precancerouscondition.
In these patients a prophylactic cholecystectomy
has been advocated because of its association
with gallbladder carcinoma .

39. U/S AND PLAIN RADIOGRAPH SHOWING GB WALL
CALCIFICATIONSi.e. PORCELAIN GALL BLADDER

40. Acalculuscholecystitis
Approx. 5% cases of acute cholecystitis occur in
the absence of gall stones.
Etiology is multifactorialand includes ischemia,
GB wall infection or cystic duct obstruction.
It may occur in very sick patientslike after
major surgery, extensive trauma and prolonged
parentralnutrition .

41. EMPHYSEMATOUSCHOLECYSTITIS
infection from gas forming organisms like Clostridium Welchii
within the GB wall or lumen.
Most often occur in diabetics or immunocompromisedpatients.
Perforation is 5 times more likely than with calculus
cholecystitis.
PLAIN RADIOGRAPH
shows gas shadows from the wall and lumen of GB along with
gas-fluid levels demonstrated on erect posture.
SONOGRAPHICALLY
Manifests as very bright reflections from a non dependent part
of GB wall. The associated acoustic shadow is usually dirtyand
in many cases has a demonstrable ring down artifact ,typical
sign of gas.

42. Emphysematous cholecystitis showing (A) gas in the
lumen and wall of the gallbladder and (B) a gas-fluid
level in the erect posture.

43. CHOLESTEROSIS
There is diffuse deposition of cholesterol
on the gall bladder mucosa.
Generally asymptomatic.
Deposits are usually 1-2mm, multiple and
fixed on scanning

44. ADENOMYOMATOSIS
It is a benign, usually asymptomatic condition that
may produce diffuse or focal wall thickening due to
round cell infilteration,musclehypertrophy and
mucosal herniationsinto the muscular layer called
Rokitansky_Aschoffsinuses.
Sonographically,the cholesterol crystals deposited in
Rokitansky-Aschoffsinuses result in bright reflections
and short comet-tail artefactsarising from GB wall

45. Oral cholangiographyreveals three types of pictures ,
Fundal nodular filling defect
Strictures at any site with in gall bladder.
Epithelial sinuses, which may only become apparent
following contraction with contrast trapped within
small mural diverticula.

46. Fundal nodule of adenomyomatosis before and aftergallbladder contraction.
Note long cystic duct medial to common bile duct,a congenital anomaly.

47. ADENOMYOMATOSIS SHOWING COMET -TAIL ARTEFACTS
FROM THE SUPERFICIAL WALL OF GALL BLADDER

48. GALL BLADDER POLYPS
It is a benign, usually asymptomatic
condition that may produce cholesterol
polyps, which are usually small and are
the most common polypoidlesion of gall
bladder.
SONOGRAPHICALLY
Appear as a non-mobile, non-shadowing
“ball on the wall”.

49. Gall bladder polyp fixed to the ventral wall of the gallbladder.

50. GALLBLADDERCARCINOMA
Adenocarcinomaof gall bladder is associated with
stonesin over 90% of cases.
Female to male ratio is 3: 1
Porcelain gall bladder and sclerosing cholangitis are
predisposing factors.
RADIOLOGICALLY
U/Sand CTmay demonstrate a soft tissue mass
within and adjacentto the gall bladder, often with
direct extension into related liver segments.
Cholangigraphyreveals biliary stricturing often with
intrahepatic ducts dilatation.

51. GB CARCINOMA WITH MARKED GENERALISED WALL THICKENING WITH FEW
CALCULI REPRESENTING FILLED LUMEN/CE-CT IMAGE SHOWS THICK WALLED
GALL BLADDER WITH LOCAL INFILTERATION IN ADJACENT LIVER PARENCHYMA

52. DISORDERSOFBILEDUCTS
COMMON BILE DUCT AND INTRA HEPATIC STONES
The spectrum of presentation of common duct stones
is wide, ranging from septicemia resulting from
untreated biliary obstruction and cholangitis to an
incidental finding on u/s.
May accompanied by Gall bladder stones.

53. Very large gallstone (arrow) in dilated
bile duct shown at ERCP.
‘Meniscus’ sign of impacted stone
(arrow) in bile duct.

54. BENIGN BILIARY STRICTURES
POST SURGICAL STRICTURES
Four main groups of operation carry the risk of stricture formation;
 Cholecystectomy (open or laproscopic);
Bile duct injury,withtransectionor devascularisation, may result in a
post operative bile leak or stricture formation, site of cystic duct
insertion is at highest risk.
 Biliary disconnection and drainage of the bile ducts;
Roux loop anastomosis to the common hepatic duct and
portoenterostomy (Kasai operation) carry a risk of anastomosis
stricturing.
 Hepatic resection;
These operations carry the risk of arterial devascularisationof hepatic
artery.
 Transplantation;
An anastomoticstricture will occur in 5-14 % of liver transplants.

55. Stricture of a hepaticojejunostomy.Benign postcholecystectomy stricture of
common duct (arrow). Typical site at
the level of ligation of cystic duct.

56. CHRONIC PANCREATITIS
Any cause pancreatitis may result in a low bile duct
stricture and biliary obstruction.
BLUNT OR PENETRATING LIVER TRAUMA
Injury to bile duct or gall bladder occurs in approx.
5% of liver trauma cases leads to biliary leaks and
stricture formation.

57. PRIMARY SCLEROSING CHOLANGITIS
This is a disease of unknown aetiology, characterized by an
inflammatory process affecting the intra and extra hepatic
ducts.
The condition may occur at any age. Biliary cirrhosis and
hepatic failure ensue
There is a predisposition of developing bile duct cancer.
CHOLANGIOGRAPHYdemonstrates multifocal stricturing of bile
ducts. Strictures of extrahepatic bile duct may be long or short
and multiple. Severity of extra hepatic involvement carry worse
prognosis.
U/S & CTmay demonstrate segmental duct dilatation and
increased periductalreflectivity. Regional lymphadenopathy
may be seen ,this may be associated with features of cirrhosis
and portal hypertension.

58. Characteristic stricturing of sclerosing cholangitis involving
the intra-and extrahepatic biliary system.

59. PARASITIC INFECTION
The common parasites which infest the biliary system are;
CLONORCHIS SINENSIS:
This is endemic in South-East Asia, and enters the human
body from undercooked and contaminated fish. Live
worms within the biliary tree cause periductalfibrosis and
stone formation. However upto 75% patients remain
asymptomatic.
ASCARIS LUMBRICOIDES
Endemic in Asia,Africaand South America. This worm
infests the small bowel. Upto 10%patients show biliary
infestation, among these 40% will have significant
complications. Septic cholangitis with biliary abscess,
cholecystitis with empyema and biliary strictures are the
sequelae which carry highest morbidity

60. ECCHINOCOCCUS GRANULOSUS
In hydatid disease of liver, biliary manifestations like
cholangitis and jaundice result from rupture of the cyst
into bile duct. Diagnosis is confirmed by CT and
ultrasound.
ENTAMOEBA HISTOLYTICA
Amoebiasismay produce liver abscess which
communicate segmental bile ducts producing cholangitis.

61. Ascoris lumbricoides. Ascaris worm
in the biliary ducts.
Cholecystostomy tube study showing
multiple worms extending from common
bile duct into duodenum.

62. TUMOURS OF BILE DUCT
CHOLANGIOCARCINOMA/KLATSKIN
This develops at young age mostly presents under
the age of 50.There is male preponderance.
Slow growing, locally invasive tumourwith frequent
involvement of hepatic artery and portal venous
system. Distant metastasis is not common, occurs in
only 12% of patients.
Tumourprognosis is poorwith a survival of only 2
months if untreated.

63. Cholangiocarcinoma of the hilum with a characteristic stricture
involving the confluenceof the main left and right hepatic ducts.

64. Ampullaryand Pancreatic carcinoma
Ampullaryand Pancreatic carcinoma.
These are the most common causes of a malignant bile duct
stricture.
Indications for radiological assessment are,
Define site and size of tumour.
Confirm a tissue diagnosis by guided biopsy.
Determine operability by excluding, local involvement of
vessels, regional lymphadenopathy,ascites and distant
metastasis .

65. Billiarycystadenomaand Cystadenocarcinoma.
These are rare tumoursof biliary epithelium present as
complex, cystic masseswithin liver parenchyma which may
infiltrate segmental bile ducts.
Radiological assessment is based on determining segmental
distribution and vascular relationships.

66. Low common bile duct stricture,
with characteristic features of
extrinsic compression from a
pancreatic mass(arrow).
‘Double duct ‘ sign. Concomitant
strictures of pancreatic duct and
bile duct(arrows) diagnostic of
carcinoma of head of pancreas.

67. INDICATIONS OF ENDOSCOPIC
SPHINCTEROTOMY
CBD stones with or without GB stones
CBD stones following cholecystectomy with or without
a T-tube in place.
Ampullarycarcinoma
Malignant bile duct strictures prior to stent insertion
Benign papillary stenosis
Post surgical strictures before dilatation or stent
placement
Choledochal fistula
Choledochocele.

68. INDICATIONS OF STENTING FOR BENIGN BILE DUCT
DISORDERS
Early structuring or anastomoticleak following liver
transplant.
As a preclude to definitive surgery in iatrogenic
transectionof bile duct with biliary leak.
Failed stone extraction or a large impacting stone
associated with biliary obstruction
Benign strictures in patients unfit for surgery.
Recurrent anastomoticstrictures following surgery.

69. TYPES OF STENT
PLASTIC STENTS: They are made of Teflon
METALLIC STENTS: They are further divided into
Self-expanding stents(Rosch-Z stent)
Balloon expandable stents(Palmaz-stent)

70. ANGIOGRAPHICINTERVENTION
The main indication of angiographic intervention is
embolizationin the presence of haemobilia.Patient
present with jaundice and GI bleeding with malena,
could be due to
Blunt or penetrating liver injury
Liver tumours
Vascular malformations
Iatrogenic trauma, either surgical or following
percutaneousliver biopsy
Multiorganfailure with DIC.
ULTRASOUND shows reflective material within a
dilated gall bladder and bile duct.
ENDOSCOPIC CHOLANGIGRAPHY demonstrate clot
with in Bile duct and bleeding visible at the papilla.