Aneurysmal Dilatation of the Portal Vein

The rare condition of aneurysmal dilatation of the portal vein has been found incidentally by ultrasound or CT or in patients having abdominal pain, gastrointestinal bleeding, portal vein thrombosis, or obstructive jaundice78-80 (Fig. 2-44). An incomplete obliteration of the caudal-ventral intervitelline anastomotic vein or the intermediate-dorsal, intervitelline anastomotic vein

Fig. 2—41. Preduodenal portal vein.

An asymptomatic 45-year-old man presented with a minimal hepatic dysfunction. (a and b) Enhanced CT shows a portal vein (PV) straddling the duodenum (D) and pancreas (P) and running adjacent to the gallbladder (G). The point of confluence with the splenic vein and superior mesenteric vein was far more caudal than usual. Associated anomalies were the interruption of the inferior vena cava with hemizygos continuation (arrows), midgut malrotation, and agenesis of the caudate lobe of the liver.

Agenesis Ductus Venosus SinusoidsPatent Umbilical Vein

Lateral abdominal radiograph of a neonate shows an umbilical venous catheter traversing the patent umbilical vein (white curved arrows) and ductus venosus (curved black arrows). An umbilical artery catheter ending in the proximal abdominal aorta (large straight arrows) is seen more posteriorly.

Lateral abdominal radiograph of a neonate shows an umbilical venous catheter traversing the patent umbilical vein (white curved arrows) and ductus venosus (curved black arrows). An umbilical artery catheter ending in the proximal abdominal aorta (large straight arrows) is seen more posteriorly.

may cause a diverticulum-like protrusion that may subsequently enlarge to give rise to the aneurysmal dilatation.

Fig. 2-43. Patent ductus venosus in a 3-year-old female with cardiac failure.

(a) Enhanced CT shows a moderately dilated left portal vein (arrow) and a large vessel (curved arrow) connecting the left portal vein and IVC.

(b) Angiography with a catheter placed at the left portal vein inserted via the IVC confirms the patent ductus venosus (curved arrows) ending at the confluence of the left hepatic vein (LH) and IVC. RA = right atrium.

Essentials of Human Physiology

Essentials of Human Physiology

This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.

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