Chapter 2: The Liver Flashcards
What is the gold standard imaging for the liver
CT first, then MRI
What liver structures are not covered by the peritoneum
Bare area, falciform ligament, gallbladder fossa, porta hepatis, and area adjacent to IVC
The liver is covered by the _____ capsule
Glisson
What does the Couinaud classification do
Separates the love into 8 surgical segments
The medial segment of the left lobe is also referred to as the _______ lobe
Quadrate
What is the splanchnic circulation
Blood flow to the majority of GI organs.
Composed of celiac artery, SMA, IMA
Which vessel provides the majority of flow to the liver
Main portal vein
The main portal vein is created by the union of which two veins
SMV and splenic vein
What is the portal splenic confluence
The place where the smv and splenic vein merge
The portal vein provides the liver with what percentage of blood supply
75%
Portal veins are considered ________ because they course within liver segments
Intrasegmental
The main portal vein should measure less than ____ mm
13
Hepatic veins are considered _________ and ________ because they are located between the segments and the lobes
Intersegmental and interlobar
The hepatic veins are used to distinguish hepatic ______
Segments
The hepatic veins ________ in size as they approach the diaphragm
Increase
The hepatic artery has a ______ resistance blood blow
Low
The Mickey sign is a transverse image of the
Porta hepatis
The porta hepatis is composed of what three structures
MPV, CBD, and hepatic artery
Enlargement of hepatic veins and IVC is seen with
Right sided heart failure
Occlusion/ narrowing of the hepatic veins is seen with
Budd Chiari syndrome
The right branch of the umbilical vein becomes
The ligamentum venosum
The left branch of the umbilical vein becomes
The ligamentum teres
Recanalization of the ligamentum teres indicates
Portal hypertension
What is a diaphragmatic slip
Pseudomass of the liver resulting from hypertrophied diaphragmatic muscle bundles
What does a diaphragmatic slip look like on ultrasound
Hyperechoic strand extending from diaphragm into liver
What is the anatomic variant Riedel lobe
Tongue like extension of the right lobe
Most often seen in women
The anatomic variant “papillary process of the caudate lobe” can resemble a _____
Mass
And adult liver should measure between _____ and ____ cm
13-15
What are three indirect signs of hepatomegaly
Extension of right lobe below lower pole of kidney
Rounding of inferior tip of Rt lobe
Extension of left lobe into LUQ
Jaundice is caused by
Hyperbilirubinemia
Describe Unconjugated (indirect) bilirubin
Non water soluble bilirubin, Travels to the liver via bloodstream, then gets converted into conjugated bilirubin there
Describe conjugated (direct) bilirubin
Water soluble bilirubin, that exits the liver and its excreted into the intestines with bile
An increase in conjugated bilirubin is usually associated with
Gallstones or pancreatic mass
An increase in unconjugated bilirubin is usually associated with
Hepaticellular disease (hepatitis, cirrhosis)
Describe prehepatic jaundice
The liver cannot process the amount of hemolysis of RBCs, resulting in buildup of unconjugated bilirubin
Describe hepatic jaundice
The liver is not able to conjugate bilirubin or secrete it.
Describe posthepatic jaundice
Caused by an obstruction of bile flow, will cause elevated conjugated bilirubin
Posthepatic jaundice is also called
Obstructive jaundice
What does CEUS stand for
Contrast enhanced ultrasound
What is contrast enhanced ultrasound
Used to identify if a mass is benign by injecting contrast agent to identify lesions
(95% specifity)
What is a hepatoblastoma
Malignant pediatric liver tumor seen usually before age 5.
Most common malignant childhood tumor
There is a high incidence of hepatoblastoma in children with _____________ syndrome
Beckwith-wiedemann
What are the symptoms of hepatoblastoma
Asymptomatic a veces
Palpable abdominal mass and pain
Weight loss
Anorexia
Elevated AFP
Jaundice
Hepatomegaly
What does a hepatoblastoma look like in ultrasound
Solid hyperechoic or heterogenous mass that may contain calcifications
What is an infantile hemangioendothelioma
Most common benign liver childhood tumor, identified in the first few weeks or months of life
List the clinical and sonographic findings of hemangioendothelioma
Hepatomegaly, hemangiomas of the skin
Homogenous or complex mass that may contain calcifications or cysts
What is the most common vascular complication of a liver transplant
Hepatic artery thrombosis
Hepatic veins show ______ flow
Triphasic
Assessment of flow should be done at the _____ of respiration
End
The hepatic artery should have what type of waveform
Continuous low resistance waveform
What is the normal resistive index of hepatic artery
0.5 - 0.8
A TIPS stent is typically located between the __________and the ___________
Right portal vein, right hepatic vein
What patients usually need a TIPS stent
Pts with advanced cirrhosis and portal hypertension
Describe the function of a TIPS stent
Reduces the amount of flow to the liver by rerouting the blood coming from the portal vein to the hepatic vein
What is the primary goal of a TIPS stent
Prevent rupture and hemorrhage of gastroesophageal and other varices
What is the normal flow velocity within the stent
90-190 cm/s
What are some signs of TIPS failure
Thrombus, stenosis or stent, stenosis of hepatic veins, reversal flow and the hepatic veins, flow void, drop in stent velocity or too high of a flow
Flow in the right and left portal vein typically _______ after TIPS placement
Reverses
What primary cancers metastasize to the liver more often
Gallbladder, colon, stomach, pancreas, breast and lung
What is the most common liver cancer
Hepatocellular carcinoma (HCC)
What are the clinical findings of hepatic metastasis
Abnormal liver function tests,
Weight loss
Jaundice
RUQ pain
Hepatomegaly
Abdominal swelling with ascites
What are the sonographic findings of hepatic metastasis
Heterogenous liver, hyperechoic, hypoechoic, calcified, cystic or heterogenous masses
Hepatocellular carcinoma is most common in what gender
Men
What is a hepatoma
The malignant mass in Hepatocellular carcinoma
What is the tumor marker for Hepatocellular carcinoma
Alpha-fetoprotein (AFP)
What does Hepatocellular carcinoma look like
Solitary hypoechoic mass or
Heterogenous masses throughout the liver
Ascites
Mass with hyperechoic center
What are the clinical findings of Hepatocellular carcinoma
Elevated AFP
Abnormal liver function test
Cirrhosis
Chronic hepatitis
Weight loss
Hepatomegaly
Fever
Palpable mass
Hepatic steatosis is also called
Fatty liver disease
Describe fatty liver disease
Disorder characterized by fatty deposits (triglycerides) within the hepatocytes
Fatty liver disease can be alcoholic or ________
Non alcoholic
What are some causes of nonalcoholic fatty liver disease
Starvation, obesity, chemotherapy, diabetes, pregnancy, con fuerte disease, total parental hyperalimentation, severe hepatitis
Fatty liver disease is the hepatic manifestation of what disorder that can lead to steatohepatitis
Metabolic syndrome
What is steatohepatitis
Inflammation of the liver secondary to fatty liver disease
What are the symptoms of fatty liver disease
Often asymptomatic
Elevated liver function tests