Peritoneal & Retroperitoneal Cavities
What is the peritoneal cavity?
The potential space between the parietal and visceral layers of the peritoneum.
What is the most important aspect of patient care during an abdominal ultrasound?
Ensuring patient comfort and safety
What is the normal diameter of the abdominal aorta in adults?
Less than 3cm
How many segments are there in the liver according to the Couinaud classification?
Eight segments
What is an artifact in ultrasound?
A distortion or error in the image not representing actual structures.
Name two retroperitoneal organs
Kidneys & Pancreas
Why is it important to obtain patient history before starting an exam?
It helps guide the exam and correlates clinical data with sonographic findings
Where does the inferior vena cava (IVC) originate?
At the junction of the common iliac veins.
What is the main portal vein's function in the liver?
It supplies the liver with nutrient-rich blood from the gastrointestinal tract.
What is the shadowing artifact?
When a strong attenuation occurs, leading to a dark shadow beyond a highly reflective structure, like bone or stones.
What space in the abdomen is the Morrison's pouch located?
Between the liver and right kidney
Gloves, mask, and sometimes gowns, depending on the situation
What is an abdominal aortic aneurysm (AAA)?
An enlargement of the aorta to more than 3cm in diameter, often a sign of weakness in the aortic wall.
Which liver lobe is bordered by the gallgbladder and IVC?
The right lobe.
What is the mirror image artifact?
An artifact that occurs when sound waves bounce off a strong reflector, creating a false image on the other side of the structure.
What does the presence of free fluid in the peritoneal cavity indicate?
It can indicate ascites or internal bleeding
How should a sonographer communicate to the patient about the findings of their exam?
The sonographer should explain the procedure but not provide diagnoses, as the radiologist interprets the results
Which side of the aorta is the IVC located on?
The right side.
Name the ligament that divides the left lobe of the liver from the right lobe.
The falciform ligament.
What is posterior enhancement in ultrasound?
Brightening behind a structure that transmits sound well, such as a cyst.
Name the ligament that separates the peritoneal cavity into supramesocolic and inframesocolic spaces.
The transverse mesocolon
What should a sonographer do if a patient refuses the ultrasound exam?
Respect the patient's decision, document it, and inform the referring physician.
Name one pathology that can cause IVC dialation.
Congestive heart failure.
What vessel separates the caudate lobe from the rest of the liver?
The IVC.
How does the edge shadowing artifact appear?
It appears as a shadow at the edges of curved structures like cysts or the gallbladder.