Normal Left Gastric Vein Diameter: Ultrasound Reference
The left gastric vein (coronary vein) drains the lesser curvature of the stomach and distal esophagus, serving as a major collateral pathway in portal venous disease. Accurate measurement of its diameter on color Doppler ultrasound is clinically important because dilation reflects elevated portal pressure and predicts esophageal variceal formation. Routine assessment is therefore recommended in patients with known or suspected cirrhosis.
Normal Reference Values
| Measurement |
|---|
| <6 mm |
Clinical Significance
A left gastric vein diameter of less than 6 mm is considered normal. Diameters at or above this threshold indicate hemodynamically significant portal hypertension with diversion of flow through gastroesophageal collaterals. Progressive enlargement correlates with increasing variceal size and the risk of variceal hemorrhage, one of the most life-threatening complications of cirrhosis.
In practice, the left gastric vein diameter is used alongside portal vein diameter, spleen size, and platelet count to stratify patients for endoscopic surveillance. Reversed (hepatofugal) flow direction within the vessel, detectable on color Doppler, further increases the likelihood of high-risk varices. Key pitfalls include overlooking the vessel due to overlying bowel gas and mistaking a dilated left gastric vein for a lymph node or cystic structure.
- Liver cirrhosis with portal hypertension
- Esophageal and gastric varices
- Portal vein thrombosis with cavernous transformation
- Budd-Chiari syndrome
- Non-cirrhotic portal fibrosis
Reference: Adithan S, Venkatesan B, Sundarajan E et al. Color Doppler evaluation of left gastric vein hemodynamics in cirrhosis with portal hypertension and its correlation with esophageal varices and variceal bleed. Indian J Radiol Imaging. 2010;20(4):289-93.
Imaging Notes
The left gastric vein is best visualized with a curved-array transducer (3–5 MHz) using a subcostal or epigastric approach in the fasting state to minimize bowel gas interference. The vessel is identified arising from the portal or splenic vein and coursing superiorly along the lesser curvature; color Doppler confirms its venous nature and flow direction. Diameter should be measured in a plane perpendicular to the vessel wall at its widest visualized segment, using calipers placed inner-edge to inner-edge.
Adequate patient preparation (minimum 4–6 hours fasting) and gentle graded compression improve visualization. Breath-holding in gentle expiration optimizes the acoustic window. If the vessel is not clearly seen transabdominally, slight patient repositioning to the right lateral decubitus position may improve access.