What is portal venous phase CT?
The portal venous phase, also known as the late portal phase or hepatic phase, is a contrast-enhanced CT or MRI series that has the following characteristics: liver parenchyma is at its peak enhancement with a density >110 HU (an increase of at least 50 HU from the unenhanced baseline)
What veins are in the portal venous system?
The portal vein forms from the confluence of the superior and inferior mesenteric veins, the splenic vein, gastric vein, and cystic vein.
Where is the portal vein located?
The hepatic portal vein is a vessel that moves blood from the spleen and gastrointestinal tract to the liver. It is approximately three to four inches in length and is usually formed by the merging of the superior mesenteric and splenic veins behind the upper edge of the head of the pancreas.
What are CT phases?
CT IV contrast media administration. contrast phases. early arterial phase. late arterial phase. portal venous phase.
Where is the hypophyseal portal system located?
The hypophyseal portal system is a system of blood vessels in the microcirculation at the base of the brain, connecting the hypothalamus with the anterior pituitary. Its main function is to quickly transport and exchange hormones between the hypothalamus arcuate nucleus and anterior pituitary gland.
Where is the hypophyseal portal system?
What is hypophyseal portal system?
THE PORTAL SYSTEM The hypothalamic–hypophysial portal system is the conduit that connects the brain to the anterior pituitary. The portal system is made up of two capillary beds, one in the median eminence and the other in the anterior pituitary.
Can a CT scan show varices?
The sensitivity of CT to detect EGD varices was 58-89%, but increased to 65-100% when specifically looking at large endoscopic varices. Overall specificity was 68-82%, but increased to 97-100% when applying ≥4 mm varices criteria.
How portal hypertension is diagnosed?
How Is Portal Hypertension Diagnosed? Usually, doctors make the diagnosis of portal hypertension based on the presence of ascites or of dilated veins or varices as seen during a physical exam of the abdomen or the anus. Various lab tests, X-ray tests, and endoscopic exams may also be used.
What is the function of portal veins?
The portal vein (PV) is the main vessel of the portal venous system (PVS), which drains the blood from the gastrointestinal tract, gallbladder, pancreas, and spleen to the liver.
What is triple phase CT scan?
It is an imaging method that uses X rays to generate detailed pictures of the orgarns inside abdomen. This type of CT scan is used to diagnose certain types of cancer such as renal pelvis, hepatocellular, lymphoma, melanoma, ovarian, pancreatic & Pheochromocytoma.
What is the hypothalamic-hypophyseal portal?
The hypothalamic–hypophysial portal system is the conduit that connects the brain to the anterior pituitary. The portal system is made up of two capillary beds, one in the median eminence and the other in the anterior pituitary.
What is the hypothalamic-hypophyseal portal circulation?
human endocrine system One system, the hypothalamic-hypophyseal portal circulation, collects blood from capillaries originating in the hypothalamus and, through a plexus of veins surrounding the pituitary stalk, directs the blood into the anterior pituitary gland.
Is there a portal vein in the hypothalamus?
However, there is also a hypophyseal portal system which passes blood from the hypothalamus to the anterior pituitary 8. The portal vein usually measures approximately 8 cm in length in adults with a maximum diameter of 13 mm.
What is the hypothalamic–hypophysial portal system?
Donald K. Clifton, Robert A. Steiner, in Yen & Jaffe’s Reproductive Endocrinology (Sixth Edition), 2009 The hypothalamic–hypophysial portal system is the conduit that connects the brain to the anterior pituitary. The portal system is made up of two capillary beds, one in the median eminence and the other in the anterior pituitary.
What is the primary plexus of the hypophyseal portal system?
At the junction of the median eminence of the hypothalamus and the infundibulum, these arteries divide into a capillary network called the primary plexus of the hypophyseal portal system. This capillary plexus supplies blood to the pars distalis.
What are the characteristics of the portal vein?
Portal vein 1 Gross anatomy. The portal vein usually measures approximately 8 cm in length in adults with a maximum diameter… 2 Variant anatomy. There is an increased risk of bile duct hilar anatomical variation in the presence… 3 Development. The embryonic vitelline veins drain from the yolk sac to the sinus venosus.