Portal biliopathy

Abstract

Portal biliopathy refers to cholangiographic abnormalities which occur in patients with portal cavernoma. These changes occur as a result of pressure on bile ducts from bridging tortuous paracholedochal, epicholedochal and cholecystic veins. Bile duct ischemia may occur due prolonged venous pressure effect or result from insufficient blood supply. In addition, encasement of ducts may occur due fibrotic cavernoma. Majority of patients are asymptomatic. Portal biliopathy is a progressive disease and patients who have long standing disease and more severe bile duct abnormalities present with recurrent episodes of biliary pain, cholangitis and cholestasis. Serum chemistry, ultrasound with color Doppler imaging, magnetic resonance imaging with magnetic resonance cholangiopancreatography and magnetic resonance portovenography are modalities of choice for evaluation of portal biliopathy. Endoscopic retrograde cholangiography being an invasive procedure is indicated for endotherapy only. Management of portal biliopathy is done in a stepwise manner. First, endotherapy is done for dilation of biliary strictures, placement of biliary stents to facilitate drainage and removal of bile duct calculi. Next portal venous pressure is reduced by formation of surgical porto-systemic shunt or transjugular intrahepatic portosystemic shunt. This causes significant resolution of biliary changes. Patients who persist with biliary symptoms and bile duct changes may benefit from surgical biliary drainage procedures (hepaticojejunostomy or choledechoduodenostomy).

Key Words: Biliary disease; Extrahepatic portal venous obstruction; Portal cavernoma; Bile duct strictures; Bile duct calculi

Core tip: Extrahepatic portal vein obstruction is often encountered in children in India. It is caused by long standing thrombosis of portal vein and leads to cavernous transformation of the bridging venous collaterals. Cholangiographic abnormalities occur in majority of such patients, however, the entity stays asymptomatic in early stages. Biliopathy is a progressive disease and patients surviving to adulthood develop more severe biliary abnormalities and present with clinical disease. Now, portal biliopathy is an important clinical entity faced by hepatologists in India. Since the disease was described in early 90’s, there have been important developments in definition, pathogenesis, diagnostic modalities and therapeutic interventions of portal biliopathy.

INTRODUCTION

Portal biliopathy refers to cholangiographic abnormalities which occur in patients with portal cavernoma[1-3]. Biliary abnormalities do occur in patients with cirrhosis and idiopathic portal hypertension. These are primarily in the intrahepatic bile ducts and are caused by hepatic nodularity and fibrosis rather than portal cavernoma[4]. Some investigators have suggested that such cholangiographic abnormalities should also be defined as portal biliopathy. However, there is a general consensus that portal biliopathy should be restricted to those cholangiographic abnormalities which are caused by portal cavernoma. Other biliary diseases which may superficially resemble portal biliopathy and need to be excluded include choledocholithiasis, primary sclerosing cholangitis, biliary parasitosis, AIDS cholangiopathy, oriental-cholangio-hepatitis and cholangiocarcinoma etc.[1].

Historical background

Portal biliopathy as a clinical entity was established by 3 reports published in early 90’s. In 1989, we were confronted with biliary disease in two patients of portal cavernoma[5]. Both patients exsanguinated and died at elective gall bladder surgery. We searched the literature around that time and could not find well-documented reports of biliary disease with extrahepatic portal venous obstruction (EHPVO). From December 1989 to November 1991, we[3] prospectively studied 21 consecutive such patients for evidence of biliary tract disease. Cholangiographic abnormalities were detected in 17 (80.9%) patients. Three adult patients had clinically manifest biliary disease. The pathogenesis of these changes and their relationship with portal cavernoma was critically evaluated. Another study reported on bile duct changes in 20 patients with portal cavernoma[6]. Sarin et al[7] observed similar changes in 80% patients with EHPVO. Since then, several investigators have reported on case series of patients with portal biliopathy (Table 1)[8-22]. Portal biliopathy has been described by a multitude of names in literature. Dilawari and Chawla[6] described these cholangiographic abnormalities as “pseudosclersoing cholangitis”. Bayraktar[8] described these abnormalities resembling “pseudocholangiocarcinoma sign”. Dhiman et al[16] named it portal hypertensive biliopathy, while others have used terms extrahepatic portal biliopathy[23], vascular biliopathy[24], portal ductopathy, portal cholangiopathy[25] and portal cavernoma cholangiopathy[1] to describe this entity. However, authors believe that portal biliopathy suggested by Sarin et al[7] is appropriate term to reflect the cholangiographic abnormalities in this entity.

Table 1 Reported studies of portal biliopathy.

Ref.	Year of publication	City Country	Number of patients	Age (mean)	Male: Female	Biliary changes	Symptomatic disease
Khuroo et al[3]	1993	Kashmir India	21	14.0	13:8	81%	38%
Dilawari et al[6]	1992	Chandigarh India	20	22.0	16:4	100%	5%
Sarin et al[7]	1992	Delhi India	20	-	16:4	90%	15%
Bayraktar et al[8]	1995	Ankara Turkey	44	31.5	24:20	94%	30%
Malkan et al[9]	1999	Mumbai India	20	23.0	12:08	85%	10%
Nagi et al[10]	2000	Chandigarh India	43	-	25:18	100%	19%
Condat et al[11]	2003	Paris France	25	49.5	15:1	84%	28%
Sezgin et al[12]	2003	Mersin Turkey	36	-		94%	10%
Khare et al[13]	2005	Lucknow India	13	-	9:4	100%	100%
Belhadjbrik et al[14]	2006	Tunis Tunisia	17	-		100%	82%
Chevallier et al[15]	2006	Nice Cedex 3 France	10	-		90%	40%
Dhiman et al[16]	2007	Chandigarh India	53	24.5	36:17	100%	24.5%
Vibert et al[17]	2007	Villejuif France	64	-		100%	30%
Oo et al[18]	2009	Birmingham UK	13	-		100%	100%
Llop et al[19]	2011	Barcelona Spain	67	47.0	41:26	78%	21%
Agarwal et al[20]	2011	New Delhi India	39	29.6	27:11	100%	100%
Aguirre et al[21]	2012	Bogota Columbia	18	-		100%	100%
Aguilar-Olivas et al[22]	2014	DF Mexico	4	-		100%	100%

BILIARY ANATOMY

Biliary tract has intrahepatic and extrahepatic components. The anatomy of the intrahepatic bile duct follows that of the portal system and segmentation of the liver. The Couinaud classification divides liver in to eight (I to VIII) segments. Right liver lobe, consisting of segments V, VI, VII and VIII is drained by the right hepatic duct. The left hepatic lobe consisting of Segments II, III and IV is drained by left hepatic duct. Caudate lobe (segment 1) receives small ducts from right and left lobes. The right and left hepatic ducts join in the hilum to form common hepatic duct, which continues as common bile duct from the point cystic duct joins it laterally. Common bile duct is 6.0-8.0 cm long and has four segments namely supraduodenal, retroduodenal, retropancreatic and intraduodenal[26,27].

Biliary tree including ampulla of Vater receive blood supply from branches of the coeliac trunk[27]. The common bile duct is palisaded by 3 o’clock (left) and 9 o’clock (right) marginal arteries, which derive blood supply from right hepatic artery, left hepatic artery, cystic artery and posterior superior pancreaticoduodenal artery. The marginal arteries through intricate network of vessels form two plexuses, one around the bile duct (paracholedochal plexus) and another on the surface of bile duct (epicholedochal plexus). Several branches perforate the bile duct wall (intramural plexus) and reach under the bile duct epithelium (subepithelial plexus). The marginal arteries intercommunicate at hilum forming hilar plexus. The right and left hepatic arteries are connected with each other by communicating arcade. The intrahepatic bile ducts are accompanied by corresponding arteries and form peribiliary plexus. These arteries communicate with venules through arterioportal channels.

The venous drainage of bile duct is accomplished by epicholedochal venous plexus of Saint and paracholedochal plexus of Petren. Theses drain in to 3 o’clock and 9 o’clock marginal veins. An additional 6 o’clock marginal vein may be present posterior to bile duct. The marginal veins drain in to gastric veins, posterior superior pancreaticoduodenal vein and gastrocolic trunk[26].

PORTAL CAVERNOMA

Portal cavernoma is formed by serpiginous, tortuous and dilated 3 o’clock and 9 o’clock marginal veins and venous of plexus of Petren, that bridge thrombosed portal vein. The portal vein, following thrombosis may be atretic or re-canalized. In addition, the epicholedochal plexus of Saint on the surface of bile ducts and cholecystic veins surrounding and within gallbladder wall also dilate and become tortuous (Figure 1)[28]. Portal cavernoma formation may take from a week to a year. Over time, the portal cavernoma may turn in to a “solid tumor-like cavernoma” compromising of fibrous hilar mass containing multiple collateral veins[1,3].

Figure 1 Splenoportovenography in a patient with extrahepatic portal venous obstruction and portal cavernoma. Contrast within splenic pulp (S) is drained by multiple splenic vein channels (SV) into large peripancreatic collaterals (C). There are two broad parallel conglomerate of veins in the porta hepatis (arrows) formed by right and left paracholedochal collaterals [PCDC (R) and PCDC (L) respectively], forming the portal cavernoma. Main portal vein is not seen (thrombosed). Retrograde filling of perisplenic collaterals (PSC), gastroduodenal vein (GDV) and posterior-superior pancreaticoduodenal vein (PSPDV) is seen.

Portal cavernoma in developing countries occurs in children and results from portal vein thrombosis secondary to neonatal umbilical sepsis and dehydration. In adults, portal vein thrombosis with resultant portal cavernoma is caused by a number of conditions including hypercoagulable states, myeloproliferative disorders, Bechet’s syndrome, pancreatitis and pylephlebitis. No underlying cause is detectable in around 30% patients. Portal cavernoma formation is rare in portal vein thrombosis with underlying cirrhosis and portal hypertension, as stasis in portal venous system in such patients prevents formation of collaterals.

The diagnosis of portal cavernoma is easily made at grey scale and color Doppler sonography[29]. Portal vein is not visualized or may be atretic or recanalized. Liver hilum reveals multiple dilated serpiginous channels. Flow pattern within the tortuous channels on color and duplex Doppler show portal venous type of flow with absent respiratory or cardiac variation. Patients with solid tumor cavernoma depict an echogenic irregular mass of varying size with dilated tortuous channels passing through the mass. Hepatic arteries demonstrate increased flow to compensate for reduced portal flow. Multiphase computed tomography (CT) and magnetic resonance imaging (MRI) reveal thrombosed portal vein which may be atretic or recanalized with dilated tortuous channels, enhancing during portal venous phase and not during arterial phase. This helps to exclude arteriovenous malformation. In solid tumor cavernoma, CT and MRI show an echogenic mass with numerous venous channels. In some patients, linear areas of calcification within the previously thrombosed portal vein may be seen, indicating chronic venous thrombosis.

PATHOGENESIS

The pathogenesis of cholangiographic abnormalities in EHPVO and portal cavernoma are multifactorial[3]. Broadly the cholangiographic abnormalities have reversible and fixed component (Figure 2). Reversible component includes those changes which are likely to resolve following portal venous decompression [shunt surgery or transjugular intrahepatic portosystemic shunt (TIPS)]. These include shallow bile duct impressions and indentations causing wall irregularity, smooth strictures with upstream dilatation and luminal filling defects. These changes are as a result of dilatation of veins of the plexus of Saint, causing bile duct impingement. Bile duct strictures with upstream dilatation may be as a result of compression by dilated tortuous collaterals[30,31]. In addition, bile duct filling defects occur due to dilatation of perforators and subepithelial veins in the ducts. This hypothesis is based on findings at MRCP and MR portography which demonstrate signal void-defects of dilated veins around the bile duct lumen[32]. Rarely, bile duct wall shows localized thickening and luminal narrowing as a result of dilated tortuous choledochal vessels. Further shunt surgery or TIPS results in partial or complete resolution of cholangiographic abnormalities. In some cases, these changes of biliopathy may persist after portal decompression. This is related to persistence of portosystemic collaterals and does not necessarily imply ischemia as a cause of bile duct changes. Left hepatic duct is involved more often and shows more severe changes as umbilical vein enters left portal vein, leading to formation of prominent collaterals.

Figure 2 Endoscopic retrograde cholangiograms in 8 patients of portal biliopathy depicting spectrum of cholangiographic abnormalities of portal biliopathy. A: Extrinsic impression on common bile duct (arrow); B: Ectasia of left hepatic duct (arrow) and caliber irregularity of common hepatic duct (curved arrow); C: Ectasia of common hepatic duct (arrow) and caliber irregularity of common bile duct (curved arrow); D: Angulation (arrow) of common bile duct; E: Large smooth impression (arrow) on common bile duct; F: Angulation common hepatic duct (curved arrow) and gross ectasia of intrahepatic ducts (arrow); G: Long smooth stricture of common bile duct (arrow) with upstream dilatation (curved arrow); H: dilated bile ducts with multiple filling defects (arrow). Adapted and modified from Khuroo et al[3].

Fixed component cholangiographic abnormalities include those changes which do not regress after portal decompression. These include rigid stricture, angulation, and ductal ectasia. Rigid strictures are usually due to ischemia, which occurs as the time of portal vein thrombosis. As bile duct are supplied by hepatic arteries, ischemic necrosis may result from concomitant hepatic artery thrombosis. In addition, portal vein thrombosis per se may cause bile duct ischemia due to damage to the microvascular bile duct flow. Strictures can also form as a result of prolonged compression by dilated tortuous collaterals. Angulation and rigid strictures result from encasement of bile ducts by solid tumor-like cavernoma[1,3]. Gallstones formation results from several pathogenic mechanisms which include: (1) bile stasis due to strictures; (2) increased lithogenicity of bile; (3) reduced contractility of gallbladder due to collateral in the gallbladder wall; and (4) decreased bile flow due to liver atrophy, resulting from reduced portal venous flow[33].

CLINICAL DISEASE

Majority of patients with portal biliopathy have no biliary symptoms (asymptomatic stage). Such patients have early cholangiographic abnormalities which include duct irregularity; serration, undulation, scalloping of the duct wall; and smooth extrinsic nodular, spiral or stenotic impressions on the ducts and filling defects in the bile and hepatic ducts. This asymptomatic phase of portal biliopathy may last for years and patients develop clinical biliary disease only if they survive to adulthood. Patients with clinical disease are older and have longer duration of portal hypertension. There is sparse data on the other factors like extent of thrombosis and the presence of portosystemic shunts affecting the occurrence of symptomatic biliopathy. During the asymptomatic phase, patients often show elevated serum alkaline phosphatase, the significance of which vis-à-vis biliary disease is difficult to interpret in children. The first detectable clinical disease starts with isolated elevated serum bilirubin and/or detectable icterus[34]. The occurrence of jaundice usually points to presence of slow onset subtle biliary obstruction or hemolysis related to large spleen and is often detected incidentally while evaluating the patients for other symptoms of portal hypertension. Patients with symptomatic biliary disease have advanced cholangiographic abnormalities which include ectasia of the ducts; angulation, displacement and strictures of the bile and hepatic ducts and aneurysmal dilatation of the intrahepatic biliary tree. The patients present with episodes of biliary pain or cholangitis and/or biliary obstruction. Biliary pain may be related to gallstones or bile duct stones or to cholangitis. Biliary obstruction presents with cholestasis with or without episodes of cholangitis[34-37]. There is considerable variation in clinical presentation of biliary obstruction. However, most of patients have recurrent and progressive disease and often need to be hospitalized repeatedly to control symptoms[34,38]. Portal biliopathy late in the clinical course cause marked bile duct abnormalities which include long (> 2 cm) or multifocal strictures, strictures associated with choledochal or intrahepatic calculi and biliopancreatic complications. Therapeutic options in such patients are limited due extensive venous thrombosis and advanced liver disease.

NATURAL COURSE

Data on the natural course of biliopathy following portal vein thrombosis and portal cavernoma are scarce[18,19,39]. Only one study has reported on follow up in 22 patients of portal vein thrombosis and 45 patients with established portal cavernoma[19]. At initial assessment, majority of patients in either group had developed evidence of biliopathy. Symptomatic disease was limited to patients with severe biliary abnormalities. Over a follow up period extending up to 4 years, disease was non-progressive. Authors believed the disease to be a one-time event after acute portal vein thrombosis. However, patients with symptomatic biliopathy have established long-term disease extending for over 8 to 14 years. This suggests that natural course of portal biliopathy is progressive and long term portal hypertension and significant biliary abnormalities leading to symptomatic biliopathy[1].

DIAGNOSIS

Ultrasonography

Ultrasound with color Doppler is an excellent imaging modality in evaluation of portal cavernoma[29] (Figure 3). Gray scale and color Doppler imaging show atretic or racanalized portal vein with a mass of multiple serpentine channels, seen in the porta hepatis. These collaterals demonstrate portal venous type flow[40]. An increased flow in hepatic artery may be seen, representing a compensatory mechanism to the reduced portal flow. Color Doppler has advantage of showing varices around and in the wall of gallbladder. Bile duct wall may show collaterals within the thickened bile ducts. Ultrasound can detect bile duct dilatation with associated cholelithiasis and choledocholithiasis. In addition, hepatic parenchyma can be well seen on ultrasound with associated portosystemic collaterals and splenomegaly. However, ultrasound has limitation in visualization of common bile duct especially in retroduodenal segment and cannot differentiate between extrinsic pressure from collaterals and ischemic stricturing.

Figure 3 Ultrasound with Doppler in a patient with extrahepatic portal venous obstruction and portal biliopathy. A: Gray scale image shows an echogenic mass in hilum (portal cavernoma). Common hepatic duct (CHD) shows dilatation and luminal irregularity with a stricture at the level of the cavernoma; B: Color Doppler image showed multiple pericholedochal collaterals around the strictured bile duct (arrow); C: Color Doppler image shows pericholedochal collaterals and recanalized irregular portal vein; D: Power Doppler images of gall bladder. Gall bladder wall is thickened with multiple collaterals within the gall bladder wall.

Computed tomography or magnetic resonance imaging

Contrast enhanced computed tomography (CECT) or magnetic resonance imaging (MRI) have advantage over ultrasound in delineating the anatomy of portal venous system (portovenography), help to find cause of portal venous thrombosis like pancreatitis and exclude biliary malignancy[21]. MRI is a better imaging tool in this setting as it does not expose incumbent to radiation and delineates better biliary anatomy. MRI can differentiate epicholedochal collaterals, which appear as signal void-defects from paracholedochal collaterals which appear as low signal channels on T2-weighted images[41]. Typical biliary findings of biliopathy are well seen on MR cholangiography[15,42]. Hence MRI is the modality of choice for mapping of the biliary and vascular abnormalities[43] (Figure 4).

Figure 4 Magnetic resonance imaging with Magnetic retrograde cholangiogram in a patient with portal biliopathy. T1 weighted, T2 weighted and post-gadolinium (postgad) images. Mass lesion (short arrow) is seen at the level of porta hepatis with dilated bile ducts (long arrow) and signal void (curved arrow), depicting collateral channels compressing bile ducts, MRCP. Common bile duct (CBD) shows luminal irregularity. There is a localized irregular stricture in common hepatic duct with upstream gross dilatation of intrahepatic ducts (IHD).

Endoscopic ultrasound

Role of endoscopic ultrasound (EUS) in the diagnosis of portal biliopathy is evolving[44-47]. Portal cavernoma and its anatomy can be well defined. These collaterals appear as multiple vascular channels in and/or around the extrahepatic biliary tract. Paracholedochal, epicholedochal, intracholedochal and subepithelial varices can be well seen and differentiated[48]. Visualization of choledochal and subepithelial venous plexuses is important as biliary endotherapy may increase risk of hemobilia.

Endoscopic retrograde cholangiography

Endoscopic retrograde cholangiography (ERC) is the gold standard for defining the biliary changes of portal biliopathy (Figure 2). In fact, ERC has been employed to define bile duct changes, study their distribution in the biliary tract and assess the severity and grading of abnormalities. ERC is being replaced by ultrasound and MRCP. ERC is invasive, has risk of complications and cannot be employed on repeated occasions for follow up examinations. In contrast ultrasound and MRCP are non-invasive, give comparable images of biliary tract and have advantages to further visualize portal venous system.

Cholangiographic abnormalities on ERC known to occur in portal biliopathy include: (1) shallow extrinsic impressions/indentations of the bile and hepatic ducts; (2) deep extrinsic impressions/indentations of the bile and hepatic ducts; (3) irregularity in ductal contour; (4) strictures with upstream dilatation; (5) filling defects which may be round, oval, or elongated and are caused by stones, intra-luminal varices, or blood clots; (6) bile duct angulation causing an angle of ≤ 145^o between lower and upper ductal alignment; and (7) ectasia which cause dilated segment of biliary tree without any evident downstream obstruction. The cholangiographic abnormalities may occur in bile ducts alone, hepatic ducts alone, bile ducts with unilateral hepatic ducts and bile ducts bilateral hepatic ducts.

MANAGEMENT

Asymptomatic patients

Asymptomatic patients with portal biliopathy do not need any active treatment. Such patients have early cholangiographic abnormalities. As these changes are progressive in nature, it is worthwhile to have serial assessment of type, extent and severity of these changes on a long term follow up. Ultrasound with color Doppler is ideal imaging tool to evaluate portal cavernoma and biliary tract for strictures and stones. Patients with mild abnormalities in liver tests without clinical disease should be included in asymptomatic disease and need no active intervention.

Endotherapy

Treatment of symptomatic biliopathy can be approached in a stepwise fashion. Initial treatment is aimed at managing biliary strictures and stones. Next portal decompression should be done to reverse biliary abnormalities. Lastly biliary obstruction should be relieved by biliary diversion at surgery[17,22,49,50] (Figure 5). Patients presenting with cholestasis and/or cholangitis should be primarily managed by biliary endotherapy[2,51]. Common bile stones are managed by endoscopic sphincterotomy with stone extraction[33]. Patients with cholangitis or cholestasis need endoscopic biliary drainage with plastic stents or nasobiliary drainage[52]. Biliary strictures can be treated by balloon dilatation and stent placement[53].

Figure 5 Management algorithm in patients of extrahepatic portal venous obstruction and portal biliopathy. See text under “Management” for details. TIPS: Transjugular intrahepatic portosystemic shunt.

Advanced biliary endoscopic procedures can be employed in patients with difficult biliary calculi. Such patients need large balloon sphincteroplasty, cholangioscopy with intraductal lithotripsy using laser and electrohydraulic probes. As of now, even intractable biliary calculi in biliopathy are amenable to endoscopic therapy. Many patients need repeated plastic stents and is a problem for patients who come from far flung regions and cannot reach tertiary care centers regularly. Such patients are candidates for placement of self-expanding metal stent (Figure 6)[54]. Placement of metallic stents in a benign disease may cause difficulty in retrieval of stents if needed and intraoperative difficulty in case these patients require surgical management for persistent biliary symptoms[18,55]. Endoscopic sphincterotomy along with use of Dormia basket and balloon extraction of stones in portal biliopathy has been shown to be safe[56]. Intraductal and subepithelial collaterals are risk factors for hemobilia. Such varices can be demonstrated on EUS and it may be worth doing this procedure once biliary endotherapy is envisaged. Hemobilia, if occurs, is usually mild and needs conservative treatment and settles in most cases[55,57].

Figure 6 Endoscopic retrograde cholangiogram and metallic biliary stenting in a patient with portal biliopathy. A: Long smooth stricture common bile duct (arrow) with upstream dilatation of intrahepatic ducts (curved arrow); B: A 12 Fr plastic stent (arrow) is placed across the stricture. Patient needed repeated stent replacement in the follow up and was considered for shunt surgery. Shunt surgery was not possible due unavailability of a shuntable portal vein; C: Self-expanding nitinol biliary stent (arrow) placed across the stricture. Patient stays asymptomatic over long-term follow up.

Biliary surgery namely surgical removal of CBD calculi or bilio-enteric anastomosis without prior portal decompression carries higher mortality and should be avoided. Laparoscopic cholecystectomy for gallstones in two patients with pericholecystic collaterals and non-obstructive biliopathy has been performed safely with careful operative strategy and diligent hemostasis[58]. The use of concomitant ursodeoxycholic acid (UDCA) is recommended as it has been reported to be beneficial by some authors[59].

Shunt surgery

With advances in endotherapy, patients with biliopathy are increasingly being managed with multiple stents for prolonged periods of time. Such patients should be evaluated for surgical porto-systemic shunts or TIPS[24,25,60-63] (Figure 7). One of the strong arguments in favor of operative management has been the fact that surgery is a onetime procedure, does not require repeated hospital visits, which is particularly relevant for the majority of EHPVO patients who come from areas where specialized medical help with access to endotherapy may not be available. Shunt procedures cause regression in collaterals and as a result cause improvement in the cholangiographic abnormalities of portal biliopathy and significant clinical improvement. Follow up studies have shown that around two-thirds of patients remain asymptomatic and complete reversal of cholangiographic abnormalities.

Figure 7 Transjugular intrahepatic porto-systemic shunt in a patient with extrahepatic portal venous obstruction and portal biliopathy. Common bile duct shows a long smooth stricture (CBD) with upstream dilatation of intrahepatic ducts (IHD). Transjugular intrahepatic porto-systemic shunt (TIPS) (arrows) was placed to decompress the portal venous circulation. Follow-up showed significant improvement in cholangiographic appearances.

Even if the regression of cholangiographic changes is incomplete, majority of the patients remain asymptomatic probably due to slowing-down of progression of biliopathy after shunt. Around one third of patients continue to have cholangiographic abnormalities and may suffer from repeat biliary symptoms. TIPS, though effective in portal decompression has issues of wider accessibility and high occlusion rate at one year[64]. In patients with extensive thrombosis and non-shuntable vein or blocked shunt, patients must be managed with continued endoscopic stents. Such patients may be candidates for placement of self-expanding metal stents.

Biliary drainage

The third phase is to manage patients who continue to be symptomatic with cholangiographic changes despite portal decompression. Some patients may develop symptoms due to blocked portosystemic shunt. Biliary drainage procedures like hepaticojejunostomy or choledochoduodenostomy are performed with good clinical results[20,65]. Liver transplantation is indicated in patients with secondary biliary cirrhosis and end stage liver disease[66,67].