Are kasai procedure and roux en y hepaticojejunostony the same?

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Here is a thorough comparison based directly from the surgical textbooks:

Kasai Procedure vs. Roux-en-Y Hepaticojejunostomy

These two procedures are not the same, though they share a common element: both use a Roux-en-Y loop of jejunum for biliary drainage. The critical differences lie in the indication, anatomy of anastomosis, and the structure being connected.

Kasai Procedure (Portoenterostomy)

Feature	Detail
Full name	Kasai portoenterostomy
Developed by	Morio Kasai (Japan, late 1950s)
Indication	Biliary atresia (absence/obliteration of extrahepatic bile ducts)
What is anastomosed	The porta hepatis (cut fibrous biliary remnant at the hilum) -- NOT a bile duct, because there is no patent duct
To what	A short Roux-en-Y jejunal limb (15-25 cm, retrocolic)
Age group	Neonates/infants (best results if done < 60 days of age)
Goal	Drain bile from microscopic bile ductules within the fibrous portal plate into the bowel

The Kasai procedure involves dissecting out the fibrous biliary remnant up to the porta hepatis, sharply transecting it at the level of the portal vein bifurcation, and then anastomosing the jejunal limb directly to the cut surface of the liver hilum. There is no true bile duct being sewn -- the anastomosis is to liver tissue at the porta.

From Mulholland and Greenfield's Surgery:

"A nonpatent, fibrous cord rather than a normal common bile duct is found in the hepatoduodenal ligament. This cord is dissected free proximally to the level of the porta hepatis between the portal vein bifurcation. The fibrous remnant is sharply transected at this level to preserve any patent bile ducts. A short, 15- to 25-cm retrocolic, jejunal Roux-Y limb is constructed."

Roux-en-Y Hepaticojejunostomy

Feature	Detail
Full name	Roux-en-Y hepaticojejunostomy
Indications	Choledochal cysts (after resection), biliary strictures, bile duct injuries, pancreaticoduodenectomy (Whipple), liver transplantation biliary reconstruction, recurrent CBD stones
What is anastomosed	A patent hepatic duct (common hepatic duct or left/right hepatic duct)
To what	A Roux-en-Y limb of jejunum (typically 60 cm), side-to-side or end-to-side
Age group	Any age; adults most commonly
Goal	Bypass or reconstruct an obstructed/resected bile duct using a defunctionalized jejunal limb

In this operation, a proper, patent bile duct is identified and sutured to the jejunum. The anastomosis is a true ductal anastomosis (single-layer absorbable suture), not to raw liver parenchyma.

Key Comparison Summary

	Kasai Portoenterostomy	Roux-en-Y Hepaticojejunostomy
Indication	Biliary atresia	Bile duct obstruction/injury/resection
Anastomosis to	Porta hepatis (raw liver hilum)	Hepatic bile duct (patent duct)
Bile duct present?	No - obliterated	Yes - patent duct sutured
Patient age	Neonates/infants	Any age
Roux-en-Y limb used?	Yes	Yes
Outcome	~66-75% achieve bile flow; most eventually need transplant	Generally durable biliary drainage

The Shared Element

Both procedures use a Roux-en-Y configuration to divert enteric content and prevent bile reflux into the biliary tree. This is where the similarity ends. The Kasai procedure is a specific variant designed for the unique pathology of biliary atresia, where no duct exists to anastomose. A hepaticojejunostomy, by definition, requires a hepatic duct to sew to the jejunum.

In fact, after a failed Kasai procedure, patients who progress to liver transplantation will often have a hepaticojejunostomy constructed as part of the biliary reconstruction in the transplant - illustrating that they are sequential, not synonymous operations.

Mulholland and Greenfield's Surgery, 7e, p. 5601
Clinical Gastrointestinal Endoscopy, 3e, p. 190

What is pirta hepatizls

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You likely meant porta hepatis - here is a full explanation:

Porta Hepatis ("Gateway of the Liver")

The term comes from Latin: porta = gate/door, hepatis = of the liver. It is the hilum of the liver - a transverse fissure on the visceral (inferior) surface where structures enter and leave the liver.

What passes through the porta hepatis?

The porta hepatis contains the portal triad (three key structures) in a consistent arrangement within the hepatoduodenal ligament:

Structure	Position	Direction
Portal vein	Posterior	Enters liver (carries nutrient-rich blood from gut)
Hepatic artery proper	Left-lateral, anterior	Enters liver (oxygenated blood)
Bile ducts (hepatic ducts)	Right-lateral, anterior	Exits liver (carries bile out)
Lymphatics & nerve plexus	Also present	Enter/exit

From Gray's Anatomy for Students:

"The porta hepatis serves as the point of entry into the liver for the hepatic arteries and the portal vein, and the exit point for the hepatic ducts."

From Fischer's Mastery of Surgery:

"The hepatoduodenal ligament encloses the portal triad, consisting of the bile duct, hepatic artery, and portal vein... The portal vein lies posteriorly, while the proper hepatic artery lies left lateral and the bile duct lies in the right lateral aspect of the hepatoduodenal ligament anterior to the portal vein."

Clinical Relevance

Pringle Manoeuvre: The hepatoduodenal ligament (containing the porta hepatis structures) can be clamped between the thumb and forefinger to temporarily stop blood flow into the liver during surgery - used to control haemorrhage during hepatic resection.
Kasai procedure: In biliary atresia, the fibrous biliary remnant is dissected all the way up to the porta hepatis and transected there to expose any residual microscopic bile ductules.
Hilar cholangiocarcinoma (Klatskin tumour): A tumour arising at the confluence of the right and left hepatic ducts, right at the porta hepatis - notoriously difficult to resect due to the proximity of portal vein and hepatic artery.
Liver transplantation: The portal triad structures at the porta hepatis (portal vein, hepatic artery, bile duct) are all anastomosed individually during implantation of the donor liver.
Trauma: Injuries to the porta hepatis carry a mortality rate of ~51% overall, rising to 80% with multiple structure injuries, due to the concentration of major vascular and biliary structures in a small space. - Current Surgical Therapy 14e

In the context of our earlier discussion, when we said the Kasai procedure anastomoses the jejunum to the porta hepatis, it means the jejunum is sewn directly onto the cut surface of the liver hilum at this anatomical gateway, to drain bile from whatever microscopic ductules remain there.

Gray's Anatomy for Students, p. 392
Fischer's Mastery of Surgery 8e, p. 4778-4779
Current Surgical Therapy 14e, p. 491

Ercp

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Here is a comprehensive overview of ERCP:

ERCP - Endoscopic Retrograde Cholangiopancreatography

What is it?

ERCP is a combined endoscopic + fluoroscopic procedure used to visualize and intervene on the biliary and pancreatic ducts. It uses a side-viewing (duodenoscope) - unlike standard endoscopes that look forward - because the ampulla of Vater sits on the medial wall of the second part of the duodenum and is best seen from the side.

Today, ERCP is predominantly therapeutic, not diagnostic. For pure diagnostic imaging of the biliary tree, MRCP is preferred due to the risk of ERCP complications.

Equipment

Side-viewing duodenoscope (with an elevator/bridge to direct accessories)
Fluoroscopy (X-ray) machine
Contrast dye
Accessories: sphincterotome, guidewires, extraction balloons, baskets, stents

Technique (Step by Step)

Patient placed prone (or supine if needed, e.g. during laparoscopic cholecystectomy); IV sedation or general anaesthesia
Side-viewing scope passed blindly into oesophagus → stomach → duodenum
Scope manoeuvred into "short-scope" position in the second part of the duodenum, where the ampulla of Vater (major papilla) is visible on the medial wall
Glucagon may be given to reduce duodenal peristalsis
Papilla is cannulated using a pull-wire sphincterotome or cannula over a guidewire
- Bile duct: enters at 11 o'clock, below the "lip" of the papilla
- Pancreatic duct: enters perpendicularly at 1 o'clock
Contrast injected under fluoroscopy to visualise ducts
Therapeutic intervention performed as needed

Indications

From Maingot's Abdominal Operations:

#	Indication
1	Suspected choledocholithiasis (CBD stones)
2	Malignant or benign biliary/pancreatic strictures
3	Abnormal biliary imaging
4	Persistent jaundice / cholangitis
5	Sphincter of Oddi dysfunction (SOD)
6	Bile duct injury / leak / trauma
7	Ampullary adenoma treatment
8	Recurrent or idiopathic pancreatitis
9	Chronic pancreatitis (stones, strictures)
10	Pancreatic fluid collections / necrosis
11	Cytology of suspected pancreatic cancer

Therapeutic Interventions Possible at ERCP

Intervention	Use
Biliary sphincterotomy	Cut the sphincter to allow stone passage; most common intervention
Stone extraction (balloon/basket)	Remove CBD stones; go distal-to-proximal
Large balloon sphincteroplasty	For stones > 15 mm
Mechanical / laser lithotripsy	Fragment very large stones
Stent placement (plastic or metal)	Bypass strictures (malignant or benign)
Biliary dilation	Treat strictures
Nasobiliary drain	External biliary drainage
Needle knife / precut sphincterotomy	When standard cannulation fails (higher risk)

Complications

Complication rate overall is < 10%. The four major specific complications are:

Complication	Details
Post-ERCP Pancreatitis (PEP)	Most common complication (~5%); pancreatography and difficult cannulation are key risk factors
Bleeding	Especially post-sphincterotomy; pure-cut current may increase bleeding risk
Perforation	Duodenal or retroperitoneal; rare but serious
Cholangitis	Most important risk factor = incomplete drainage of an obstructed system; seen in hilar strictures (Bismuth III/IV), PSC, post-liver transplant

Also:

Post-ERCP cholecystitis (1.9-12%, especially with metal stents)
Cardiopulmonary events from sedation
Infection from inadequate scope reprocessing (MDR organisms like Klebsiella, E. coli, Pseudomonas from the elevator mechanism)

Contraindications / Special Situations

Roux-en-Y anatomy (e.g. post-gastric bypass): standard ERCP difficult or impossible; requires enteroscopy-assisted ERCP or surgical/radiologic access
Coagulopathy: avoid sphincterotomy if INR is high
Active pancreatitis: ERCP only if biliary obstruction/cholangitis present

ERCP vs. MRCP

	ERCP	MRCP
Type	Invasive (endoscopic)	Non-invasive (MRI)
Use	Therapeutic + diagnostic	Diagnostic only
Risk	Pancreatitis, bleeding, perforation	None
When to choose	When intervention planned	When only imaging needed

Connection to Previous Discussion

ERCP cannot be performed after a Roux-en-Y hepaticojejunostomy or Kasai portoenterostomy via standard technique, because the ampulla is bypassed by the biliary-enteric anastomosis. Accessing the hepaticojejunostomy anastomosis requires deep enteroscopy (balloon-assisted), and the intrahepatic ducts may only be accessible percutaneously or via EUS-guided approaches.

Maingot's Abdominal Operations, pp. 65-66
Clinical Gastrointestinal Endoscopy 3e, pp. 806, 841
Sleisenger & Fordtran's GI and Liver Disease

Eeco vs mrcp

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Assuming you meant EUS vs MRCP (a very common typo for "EUS"). Here is a detailed comparison:

EUS vs MRCP - Biliary Imaging Comparison

Both EUS and MRCP are used to image the biliary and pancreatic ductal systems - primarily as alternatives to diagnostic ERCP (which carries procedural risk). They are the two most important non/minimally-invasive tools for evaluating the biliopancreatic tree.

What They Are

	EUS (Endoscopic Ultrasound)	MRCP (Magnetic Resonance Cholangiopancreatography)
Type	Semi-invasive endoscopic procedure	Completely non-invasive imaging (MRI-based)
How it works	Ultrasound transducer mounted on endoscope tip, placed in stomach/duodenum adjacent to biliary structures	T2-weighted MRI sequences - bile appears bright (high signal); stones appear as dark filling defects
Frequency used	7.5-12 MHz (resolution < 1 mm)	No radiation, no contrast needed
Sedation needed?	Yes (IV sedation)	No

Accuracy for CBD Stones (Choledocholithiasis)

Parameter	EUS	MRCP
Sensitivity	98%	81-100% (state-of-art: 90-100%)
Specificity	99%	92-100%
PPV	99%	95%
NPV	98%	97-100%
Overall accuracy	97%	~97% (for large stones)

From Maingot's Abdominal Operations:

"EUS findings were verified in 463 patients: 237 true positive, 216 true negative, 2 false positives, and 4 false negatives (sensitivity 98%, specificity 99%, PPV 99%, NPV 98%, accuracy 97%). No complications were noted."

For MRCP, stone size matters significantly:

Stones 11-27 mm: sensitivity 100%
Stones 6-10 mm: sensitivity 89%
Stones 3-5 mm: sensitivity 71% (can miss small stones)
Stones can be detected down to 2 mm with modern equipment

Key Differences

Feature	EUS	MRCP
Small stones (< 5 mm)	Better - higher resolution	Can miss; sensitivity drops to ~71% for 3-5 mm
Ampullary stones	Better for ampullary region	Less reliable here
Intrahepatic duct stones	Limited (cannot visualize well)	Better - can image intrahepatic ducts
Microlithiasis / sludge	Better (intraductal detail)	May miss
Anatomy overview	Limited field of view	Better - whole biliary tree in one image
Stricture characterisation	Can biopsy (FNA) at same time	No tissue sampling
Complications	Very low (nearly none; large series show 0 complications)	None
Availability	Requires trained endoscopist	Widely available
Cost	Higher operator cost	Generally available at most centres
Contraindications	Uncooperative patient, coagulopathy	Pacemakers, metallic implants, claustrophobia, obesity
Can follow with therapy?	Yes - can do ERCP immediately after under same sedation	No - only diagnostic
Radiation	None	None

Clinical Use: Which to Choose?

From Clinical GI Endoscopy:

"EUS has emerged as a preferred alternative to ERCP in patients at intermediate risk of bile duct stones... The majority of patients in the EUS arm did not have bile duct stones and did not require ERCP; those who did have ductal stones usually underwent ERCP immediately following EUS, under the same sedation."

Clinical Scenario	Preferred Modality
Suspected CBD stone, intermediate risk	EUS (can proceed to ERCP in same session)
Suspected CBD stone, want to avoid any procedure	MRCP
Suspected small stone / microlithiasis	EUS
Suspected intrahepatic stones	MRCP
Staging pancreatic / biliary malignancy	EUS (+ FNA for tissue)
Pre-cholecystectomy workup to exclude CBD stones	Either (both very accurate)
Patient with pacemaker/metal implant	EUS (MRCP contraindicated)
Patient unfit for endoscopy	MRCP
Post-Roux-en-Y / altered anatomy	MRCP (EUS may still access; ERCP very difficult)

The Optimal Pathway

The current standard approach when CBD stones are suspected:

Transabdominal USS (first)
        ↓
  Intermediate risk?
        ↓
  EUS or MRCP
        ↓
  Stone confirmed? → ERCP (therapeutic)
  Stone excluded? → Proceed to cholecystectomy only

Up to 70% of patients sent for ERCP based on clinical criteria alone do NOT actually have CBD stones. EUS/MRCP before ERCP prevents unnecessary invasive procedures in the majority of these patients.

Also in the Biliary Imaging Arsenal

CT (unenhanced helical): sensitivity 88%, specificity 97% for stones but poor for small stones (sensitivity only 22% for identifying stone vs. dilated duct)
Intraductal Ultrasound (IDUS): best of all for tiny stones - sensitivity 97% vs 81% for ERCP - but requires deep biliary cannulation during ERCP
PTC (Percutaneous Transhepatic Cholangiography): used when ERCP not accessible (e.g. post-hepaticojejunostomy)
Maingot's Abdominal Operations, p. 1034
Clinical Gastrointestinal Endoscopy 3e, pp. 4986-4988
Mulholland and Greenfield's Surgery 7e

Ercp vs mrcp

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Here is a comprehensive ERCP vs MRCP comparison:

ERCP vs MRCP

The single most important concept:

MRCP has largely replaced ERCP for diagnostic purposes. ERCP is now reserved primarily for therapy.

From Sleisenger & Fordtran's GI and Liver Disease:

"MRCP has largely replaced ERCP for diagnostic cholangiography as a result of improvements in image quality and the noninvasive nature of MRCP."

From Harrison's Principles of Internal Medicine 22e (2025):

"MRCP has mostly replaced ERCP for diagnostic assessment of the pancreatic duct."

Side-by-Side Comparison

Feature	ERCP	MRCP
Full name	Endoscopic Retrograde Cholangiopancreatography	Magnetic Resonance Cholangiopancreatography
Type	Invasive endoscopic procedure	Non-invasive MRI-based imaging
Primary role	Therapeutic	Diagnostic
How it works	Side-viewing scope + fluoroscopy; contrast injected retrogradely via ampulla of Vater	Heavily T2-weighted MRI; bile/fluid = bright (high signal); stones/strictures = dark filling defects
Contrast needed?	Yes - iodinated contrast injected	No contrast required
Radiation?	Yes (fluoroscopy)	No
Sedation?	Yes (IV sedation or GA)	No
Invasiveness	Semi-invasive (scope into duodenum)	Completely non-invasive
Therapy possible?	Yes - sphincterotomy, stone removal, stenting, dilation, biopsy	No - imaging only
Tissue sampling?	Yes - brush cytology, biopsy, cholangioscopy	No
Complication rate	Up to 10% (pancreatitis, bleeding, perforation, cholangitis)	None
Intrahepatic ducts	Less accessible	Excellent - can image 4th-order intrahepatic ducts
Small stones (< 5 mm)	Can detect (gold standard)	May miss (sensitivity drops to ~71% for 3-5 mm stones)
PSC diagnosis	Historically gold standard; still used when MRCP equivocal	First-line now
Contraindications	Coagulopathy, post-Roux-en-Y anatomy, contrast allergy	Pacemakers, metallic implants, claustrophobia, severe obesity
Post-Roux-en-Y	Very difficult/impossible via standard scope	Works normally
Cost	Higher (procedure + personnel + theatre)	Moderate (MRI scanner time)

How They Image the Ducts

MRCP - the physics:

"Very heavily T2-weighted images are used. Virtually all solid tissue has low signal (dark). Fluid within the biliary tree, gallbladder, and pancreatic duct retains signal intensity and therefore appears bright. Multiple projections similar to conventional cholangiography can be obtained." - Yamada's Textbook of Gastroenterology

Entire biliary tree imaged in a single 20-second breath-hold
Can visualise down to 4th-order intrahepatic bile ducts
No instrumentation, no radiation, no dye injection

ERCP - direct cannulation:

Ampulla cannulated at the duodenoscope tip
Contrast injected under live fluoroscopy
Bile duct (11 o'clock) and pancreatic duct (1 o'clock) selectively filled

Diagnostic Accuracy Compared

Condition	ERCP	MRCP
CBD stones (overall)	~100% (gold standard)	Sensitivity 90-100%, specificity 92-100%
Stones > 10 mm	~100%	~100%
Stones 3-5 mm	~100%	~71%
Biliary strictures	High	Sensitivity 85.7%, specificity 100%
PSC	Historically gold standard	Now first-line (meta-analysis: sufficiently sensitive/specific)
Pancreatic duct pathology	Good	Good (has largely replaced ERCP for this)

When to Use Which

Clinical Situation	Best Choice
Suspected CBD stone, want diagnosis first	MRCP
Suspected CBD stone, high probability - plan to treat	ERCP (diagnostic + therapeutic in one)
PSC work-up	MRCP first; ERCP if equivocal or therapy needed
Pancreatic cancer staging / biliary obstruction	MRCP for anatomy; ERCP for stenting/palliation
Cholangitis requiring urgent drainage	ERCP (immediate therapy)
Bile duct injury post-cholecystectomy	MRCP to map anatomy; ERCP for stenting
Chronic pancreatitis assessment	MRCP (non-invasive); ERCP if intervention needed
Contraindication to MRI (pacemaker)	ERCP or EUS
Post-Roux-en-Y or hepaticojejunostomy	MRCP (ERCP cannot reach ampulla)

The Modern Decision Algorithm

Suspected biliary/pancreatic pathology
            ↓
    Start with MRCP
    (non-invasive, no risk)
            ↓
   Positive / confirms pathology?
            ↓
       Proceed to ERCP
   (for therapeutic intervention)
            ↓
   MRCP equivocal + high suspicion?
            ↓
   Proceed to ERCP anyway
   (more sensitive for small stones,
    allows tissue sampling)

What ERCP Can Do That MRCP Cannot

Sphincterotomy
Stone extraction (balloon/basket)
Biliary stent placement (plastic or SEMS)
Stricture dilation
Brush cytology / intraductal biopsy
Cholangioscopy (Spyglass) - direct visualisation inside the duct
Nasobiliary drain placement
Immediate treatment of cholangitis

Summary in One Line

MRCP = look. ERCP = look AND fix.

Use MRCP whenever you only need a picture. Use ERCP when you need to do something inside the duct - or when MRCP has failed to give a definitive answer.

Sleisenger & Fordtran's GI and Liver Disease, p. 1299
Mulholland and Greenfield's Surgery 7e, p. 2788
Yamada's Textbook of Gastroenterology 7e
Harrison's Principles of Internal Medicine 22e (2025)

What is roux en y

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Here is a complete explanation of the Roux-en-Y:

Roux-en-Y - What It Is

Roux-en-Y (pronounced "roo-en-why") is a surgical reconstruction technique that creates a Y-shaped configuration from the jejunum. It was developed by Swiss surgeon César Roux (1857-1934).

The Core Concept

The "Y" shape is created by:

Dividing the jejunum about 10-15 cm distal to the ligament of Treitz
This creates two limbs:
- Efferent (Roux) limb - the distal segment, brought up to connect to whatever structure needs drainage (stomach, bile duct, oesophagus, pancreas)
- Afferent (biliopancreatic) limb - the proximal segment (still attached to duodenum, carries bile + pancreatic juice)
The afferent limb is then re-joined (jejunojejunostomy) to the efferent limb ~40-60 cm below the upper anastomosis
This creates the "Y" shape

         [Stomach / Bile duct / Oesophagus]
                      |
              Upper anastomosis
                      |
              EFFERENT LIMB (Roux limb)
                 ~40-60 cm
                      |
              Jejunojejunostomy ←── AFFERENT LIMB
                      |              (carries bile +
              Continues to               pancreatic juice
               distal bowel              from duodenum)

Why It's Done - The Key Benefit

The critical purpose of the Roux-en-Y is to prevent bile and pancreatic juice from refluxing back into the connected structure (stomach, oesophagus, bile duct). By making the efferent limb at least 40 cm long, the biliopancreatic secretions drain into the bowel well below the upper anastomosis and cannot reflux back up.

From Clinical GI Endoscopy:

"The Roux-en-Y reconstruction prevents biliopancreatic fluids from refluxing into the stomach in patients who have undergone gastric resection... To be effective, the efferent limb has to measure at least 40 cm from the gastrojejunal anastomosis to the jejunojejunal anastomosis."

The Three Limbs of a Roux-en-Y

Limb	Also called	Contents	Connected to
Efferent / Roux limb	Alimentary limb	Food (and eventually bile lower down)	Upper structure (stomach, bile duct, etc.)
Afferent / biliopancreatic limb	Biliary limb	Bile + pancreatic juice	Reconnected to efferent limb ~40-60 cm below
Common channel	Distal intestine	Food + bile + pancreatic juice mixed	Continues to ileum and colon

Applications - Where Roux-en-Y is Used

The same Y-shaped bowel configuration is applied in many different situations:

Procedure	Upper Anastomosis	Why Roux-en-Y Used
Roux-en-Y Gastrojejunostomy (after gastrectomy)	Gastric remnant → jejunum	Prevent bile reflux gastritis
Roux-en-Y Gastric Bypass (bariatric)	Small gastric pouch → jejunum	Weight loss + reduce reflux
Roux-en-Y Hepaticojejunostomy	Hepatic bile duct → jejunum	Biliary reconstruction after CBD injury/resection, choledochal cyst, Whipple
Kasai Portoenterostomy	Porta hepatis → jejunum	Biliary drainage in biliary atresia
Roux-en-Y Oesophagojejunostomy	Oesophagus → jejunum	After total gastrectomy
Roux-en-Y Pancreaticojejunostomy	Pancreatic duct → jejunum	Whipple procedure, chronic pancreatitis
Roux-en-Y Choledochojejunostomy	CBD → jejunum	Biliary bypass for malignant obstruction

Why Not Just Use a Simple Loop?

A simple loop gastrojejunostomy (Billroth II) connects the stomach to a loop of bowel - but bile can still reflux back into the stomach through the short afferent limb. The Roux-en-Y eliminates this because the biliopancreatic limb joins at a point 40-60 cm downstream, making reflux mechanically impossible against intestinal peristalsis.

Potential Complication: Roux Stasis Syndrome

One downside of the Roux-en-Y is Roux stasis (or Roux limb syndrome) - the efferent limb can lose normal peristaltic coordination after being divided, leading to delayed gastric emptying and food stasis. This is more common with longer Roux limbs.

Why ERCP Becomes Difficult After Roux-en-Y

As discussed earlier - after a Roux-en-Y reconstruction, the ampulla of Vater is now far away, accessed only by travelling down the short afferent limb from the jejunojejunostomy. A standard duodenoscope cannot reach this far. Balloon-assisted enteroscopy-ERCP or percutaneous/EUS-guided approaches are required instead.

Maingot's Abdominal Operations, p. 495
Clinical Gastrointestinal Endoscopy 3e, p. 130

Any imaging illustration?

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Here are three excellent textbook illustrations:

1. Roux-en-Y Gastric Bypass (Bariatric) - showing the Y anatomy clearly

Roux-en-Y Gastric Bypass and bariatric procedures

Panel A is the clearest illustration of the Roux-en-Y concept. You can see:

Small gastric pouch (15-30 mL) at the top connected to the oesophagus
The Roux (efferent/alimentary) limb (75-150 cm) - brings food down
The biliopancreatic limb (40-75 cm) - carries bile and pancreatic juice
The common channel where they join - food mixes with bile/enzymes here
The bypassed (excluded) stomach and duodenum below

The Y-junction at the bottom is exactly what the name refers to.

2. Roux-en-Y Hepaticojejunostomy - step by step surgical illustration

Hepp-Couinaud hepaticojejunostomy construction steps A-D

From Fischer's Mastery of Surgery. This shows:

A: Dissection at the porta hepatis, identifying bile duct (green), portal vein (blue), hepatic artery (red)
B: Running suture anastomosis being performed between bile duct and jejunum
C: Final configuration of the Roux-en-Y hepaticojejunostomy - note the Y shape of the jejunum below
D: Same with a loop gastrojejunostomy added alongside

3. Bilioenteric Anastomoses - Roux-en-Y Hepaticojejunostomy vs Choledochoduodenostomy

From Clinical GI Endoscopy. Panel A (left) shows the Roux-en-Y hepaticojejunostomy - the green bile duct anastomosed to the jejunal limb, with the stomach and duodenum completely untouched above. Panel B (right) shows a choledochoduodenostomy for comparison (bile duct anastomosed directly to duodenum instead).

These three images together give a complete picture of the Roux-en-Y configuration across its different applications - from bariatric surgery (gastric bypass) to biliary reconstruction (hepaticojejunostomy).

Fischer's Mastery of Surgery 8e, Fig. 170.3
Clinical GI Endoscopy 3e, Fig. 12.15
Fischer's Mastery of Surgery 8e, Fig. 115.5

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