Abdominal Venous Hum
The abdominal venous hum results from conditions which cause portal vein hypertension. Collateral venous channels are opened between the portal and the systemic venous channels, and the resultant flow of blood from the high-pressure portal system to the lower pressure systemic system in some way results in the hum. If the patient has portal hypertension and abdominal venous hum resulting from a congenitally atrophic liver and patent umbilical vein, the condition is called Cruveilhier–Baumgarten disease. If the portal hypertension and venous hum result from cirrhosis of the liver or other causes, the condition is known as the Cruveilhier–Baumgarten syndrome. The number of reported cases in which cirrhosis is absent is very small.