Longitudinal Scanning of the Common Bile Duct by the Right Subcostal and Right Upper Abdomen

Longitudinal biliary section • Common Bile Duct • Right subcostal and right upper abdominal approach

Scanning Method

The patient should preferably be fasted for 8–12 hours and examined in the supine position. Place the ultrasound probe in the right subcostal region and right upper abdomen. Adjust probe position, angulation, rotation, depth, and respiratory position to obtain a longitudinal view of the common bile duct (CBD) and its relationship to the porta hepatis, portal venous structures, and adjacent upper abdominal anatomy.

Key scanning point: Use the right subcostal and right upper abdominal windows to optimize visualization of the CBD. The supplied reference image demonstrates RL, CHD, RHD, RPV, RHV, St, PH, CBD, PV, and IVC.

Ultrasound Image

Figure 1.1: Longitudinal right upper abdominal sonographic view demonstrating the labeled hepatic, biliary, vascular, and adjacent structures.

Anatomical / Scanning Diagram

Figure 1.2: Reference image showing the right subcostal/right upper abdominal scanning orientation and the anatomical landmarks used to identify the common bile duct.

Section Structure

The principal structures identified in the supplied image are the right lobe of the liver (RL), common hepatic duct (CHD), right hepatic duct (RHD), right portal vein (RPV), right hepatic vein (RHV), stomach (St), pylorus (PH), common bile duct (CBD), portal vein (PV), and inferior vena cava (IVC). These structures provide important anatomical landmarks for orientation of the longitudinal common bile duct view.

Structures to identify

• Right lobe of liver (RL)
• Common hepatic duct (CHD)
• Right hepatic duct (RHD)
• Right portal vein (RPV)
• Right hepatic vein (RHV)
• Stomach (St)
• Pylorus (PH)
• Common bile duct (CBD)
• Portal vein (PV)
• Inferior vena cava (IVC)

Abbreviations Used in the Figure

Abbreviation	Full form	Identification
RL	Right Lobe of Liver	Right hepatic lobe/parenchyma demonstrated in the scanning field.
CHD	Common Hepatic Duct	Biliary duct formed by the union of the right and left hepatic ducts.
RHD	Right Hepatic Duct	Biliary duct draining the right hepatic lobe.
RPV	Right Portal Vein	Portal venous branch supplying the right hepatic lobe.
RHV	Right Hepatic Vein	Hepatic venous structure draining the right hepatic lobe toward the IVC.
St	Stomach	Stomach visualized adjacent to the hepatobiliary region.
PH	Pylorus	Pyloric portion of the stomach adjacent to the hepatobiliary structures.
CBD	Common Bile Duct	Extrahepatic biliary duct and the principal target of this scanning view.
PV	Portal Vein	Portal venous structure within the porta hepatis.
IVC	Inferior Vena Cava	Major venous landmark posterior to the liver.

Abbreviation note: The abbreviations above are taken from the labels visible in the supplied ultrasound image.

Measuring Method and Normal

When clinically indicated, assess the CBD in a clear longitudinal and transverse plane. Place the calipers across the duct lumen at an appropriate site and avoid including the duct wall or adjacent portal venous structures. The CBD caliber should be interpreted together with the intrahepatic ducts, clinical findings, patient age, and the remainder of the hepatobiliary examination.

Structure	Caliper method	Reference / interpretation
Common Bile Duct (CBD)	Measure the visible duct lumen at an appropriate point with calipers placed perpendicular to the duct walls whenever possible.	Document the caliber together with the sonographic appearance and clinical context.
Common Hepatic Duct (CHD)	Measure a clearly visualized segment perpendicular to its course.	Assess together with the intrahepatic ducts and CBD.
Right Hepatic Duct (RHD)	Measure only when clearly visualized and avoid an oblique diameter.	Assess for ductal dilatation or other visible abnormality.

Measurement note: Confirm the biliary duct margins and distinguish the duct from the adjacent PV/RPV before placing calipers.

The Clinical Application Value

The right subcostal and right upper abdominal approach provides a useful scanning window for evaluating the CBD and related hepatobiliary anatomy. The supplied image provides multiple anatomical landmarks including the CHD, RHD, RPV, RHV, PV, and IVC, which can assist in orientation.

• Demonstration and assessment of the common bile duct (CBD).
• Identification of the common hepatic duct (CHD).
• Identification of the right hepatic duct (RHD).
• Assessment of the portal vein (PV) and right portal vein (RPV) as landmarks.
• Recognition of the right hepatic vein (RHV).
• Recognition of the right hepatic lobe (RL).
• Recognition of the IVC as a posterior vascular landmark.
• Assessment of the pylorus (PH) and stomach (St) when included.
• Evaluation for biliary ductal dilatation or focal abnormality.

Quick Scanning Checklist

1	Fast the patient for 8–12 hours when appropriate.
2	Position the patient supine.
3	Place the probe in the right subcostal/right upper abdominal region.
4	Adjust the probe to obtain a longitudinal view of the CBD.
5	Identify RL as the hepatic parenchymal landmark.
6	Identify CHD and RHD.
7	Identify RPV, RHV, and PV.
8	Identify CBD clearly before measurement.
9	Use IVC as an important posterior vascular landmark.
10	Assess the CBD for dilatation, intraluminal echoes, wall abnormality, or other pathology.
11	Recognize St and PH when they are included in the scanning plane.
12	Complete the examination with additional hepatobiliary views and Doppler when clinically indicated.

Diagnostic Pathology

The longitudinal right subcostal and right upper abdominal view can assist in evaluating the CBD and related biliary structures. Findings should be correlated with the complete hepatobiliary examination.

Key Sonographic Findings

• Common bile duct dilatation: Increased CBD caliber requiring correlation with intrahepatic ducts and clinical context.
• Common hepatic duct dilatation: Increased CHD caliber with assessment of upstream biliary structures.
• Right hepatic duct dilatation: Increased RHD caliber or associated upstream ductal dilatation.
• Intraductal calculus: Echogenic intraluminal focus that may demonstrate posterior acoustic shadowing.
• Biliary sludge: Echogenic or low-level intraluminal material that may demonstrate dependent distribution.
• Biliary stricture: Focal ductal narrowing with possible upstream dilatation.
• Duct wall abnormality: Irregularity or thickening of the visible duct wall.
• Obstructive pattern: Upstream biliary dilatation associated with a possible obstructing process.
• Portal-region abnormality: Abnormal tissue or mass effect that may alter the appearance or course of the biliary structures.
• Nonvisualization of the CBD: Inadequate visualization should be interpreted in relation to bowel gas, patient habitus, respiratory movement, and scanning plane.

Diagnostic note: Abnormal findings should be interpreted together with the complete abdominal ultrasound examination, Doppler assessment when indicated, clinical history, and laboratory findings. A single sonographic sign should not be used in isolation to establish a diagnosis.

Image labeling note: The supplied image abbreviations are preserved as RL, CHD, RHD, RPV, RHV, St, PH, CBD, PV, and IVC.

Hepatobiliary Ultrasound • Right Subcostal / Right Upper Abdomen

Diagnostic Sonography Reference