introduction to abdominal imaging - teamrads.com imaging 2011.pdf · lecture outline • objectives...
TRANSCRIPT
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I’m Dr. M. Welcome to Abdominal Imaging 101!
And I’m Dr. T.
+ ?
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Lecture Outline • Objectives • Relevance of material • Imaging modalities • Clinical Approach to Abdominal Anatomy
– 4 Quadrants – Retroperitoneal
• Summary
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Objectives • Learn the basic modalities for imaging
the abdomen • Learn the organs found in each of the
four abdominal quadrants • Learn retroperitoneal organs • Exposure to the presentation of
common abdominal pathologies
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Relevance • Clinical use
• 5% of visits to the ER are for abdominal pain • 1/8 ER patients get a CT scan
• Radiologist or Consulting With One • USMLE Step 1
• Some questions use radiology
• Gross anatomy exam
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What are the 4 imaging modalities commonly
utilized for the abdomen?
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Hmm… the four main modalities used in
abdominal imaging are:
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Conventional x-ray • Use
• Traditionally used for screening • Advantages
• Availability and lower cost ($50) • Well tolerated
• Disadvantages • Lower sensitivity • Ionizing radiation
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Ultrasonography • Use
• Gallbladder, biliary tree, and female pelvis • Aortic aneurysm screening • Detection of free fluid
• Advantages • Availability and lower cost ($200) • No ionizing radiation, well tolerated • Can image in any plane
• Disadvantages • Operator dependent • More difficult to interpret • Cannot penetrate gas-filled structures
http://www.pureformdiagnostics.com/media/
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Computed Tomography • Use
• Imaging of choice for most abdominal abnormalities
• Advantages • High spatial resolution • Can see most structures simultaneously • Can reconstruct images in other planes
• Disadvantages • Cost ($500) • Higher ionizing radiation dose than x-ray • Contrast reactions
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Computed Tomography • Axial perspective (looking through
the feet)
• You view one slice at a time
• Slice thickness can vary, but is generally 5 mm
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Axial CT Perspective
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Cross-Sectional Anatomy
Gall Bladder
Pancreas Liver
Stomach
Duodenum L Lobe of Liver
Aorta IVC R Kidney
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Cross-Sectional Imaging
Gall Bladder
Pancreas
Liver
Stomach Duodenum
Spleen
Aorta IVC
L Adrenal Gland R Kidney
Common Bile Duct
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Magnetic Resonance • Use
• Difficult diagnoses • Cancer staging • Vascular anatomy
• Advantages • Soft tissue contrast • No ionizing radiation • No iodinated contrast
• Disadvantages • Cost and availability ($800) • Scans take much longer • Implanted devices can make imaging difficult
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MRI
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MRI
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The Abdominal Quadrants
http://www.highlands.edu/subwebs/shenderson/API/lab_manual/body_quads.jpg
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Right Upper Quadrant
• Gallbladder • Liver • Duodenem • Pancreas • Colon • Right kidney & adrenal gland
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Right Upper Quadrant
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Right Upper Quadrant • RUQ Organs
• Gallbladder & biliary system
• Liver (right lobe) • Duodenem (1/2/3
parts) • Pancreas (head) • Colon (Hepatic
flexure/transverse) • Right kidney &
adrenal gland
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Case 1 A 20 year old woman presents to the ED with the complaint of RUQ pain with nausea and vomiting after eating a cheeseburger for dinner. On exam, she has moderate RUQ tenderness with palpation. Her WBC count is high and she has a fever. What imaging test would you request?
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RUQ Ultrasound
https://hvelink.saintlukeshealthsystem.org/library/healthguide/en-us/support/topic.asp?hwid=zm6030
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http://www.mdconsult.com/das/book/body/156574562-3/0/1492/I4-u1.0-B978-1-4160-2805-5..50140-3--f3.fig
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http://www.radrounds.com/photo/cholecystitis-ct
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Left Upper Quadrant
• Spleen • Stomach • Liver • Pancreas • Colon • Jejunum/ileum • Left kidney &
adrenal
http://www.anatomyatlases.org/HumanAnatomy/5Section/
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Left Upper Quadrant
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Left Upper Quadrant • LUQ Organs
• Spleen • Stomach • Liver (left lobe) • Pancreas (body/tail) • Left kidney/adrenal • Colon (transverse/
splenic flexure) • Jejunum/ileum
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Case 2 A 45 year old man comes in to the ED after being involved in high speed MVA. He has emergency surgery and a week later he has a fever and severe LUQ pain. What do you think has happened to him?
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Case 3 A 41 year old man presents to the ED complaining of fever, vague LUQ pain, and SOB for two days. The patient's abdominal exam reveals left upper quadrant tenderness. You request an abdominal x-ray.
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Right Lower Quadrant
http://www.anatomyatlases.org/HumanAnatomy/5Section/
• Ascending colon • Cecum/ileum • Appendix • Right ovary, fallopian tube, & uterus • Right ureter
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Right Lower Quadrant
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Right Lower Quadrant
• RLQ Organs • Ascending colon • Cecum/ileum • Appendix • Right ovary/
fallopian tube/uterus
• Right ureter
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Right Lower Quadrant
• RLQ Organs • Ascending colon • Cecum/ileum • Appendix • Right ovary/
fallopian tube/uterus
• Right ureter
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Case 4 A 28 year old female presents to the ED complaining of abdominal pain that was initially in the periumbilical area and then moved to the RLQ. She has also had nausea and vomiting. The patient's abdominal exam reveals right lower quadrant rebound tenderness as well as guarding. She has a fever and WBC count is high. Her pregnancy test is negative. What do you suspect?
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Left Lower Quadrant
• Descending & sigmoid colon
• Left ureter • Left ovary,
fallopian tube, & uterus
http://www.anatomyatlases.org/HumanAnatomy/5Section/
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Left Lower Quadrant
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• ANATOMY – Cecum – Appendix – Ascending colon – Right ovary/fallopian
tube/uterus – Right ureter
Left Lower Quadrant
• LLQ Organs • Descending/ sigmoid colon • Left ureter • Left ovary/fallopian tube/uterus
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• ANATOMY – Cecum – Appendix – Ascending colon – Right ovary/fallopian
tube/uterus – Right ureter
Left Lower Quadrant
• LLQ Organs • Descending/ sigmoid colon • Left ureter • Left ovary/fallopian tube/uterus
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Case 5 A 58 year old man presents to the ED complaining of lower abdominal pain and fever. On physical examination, he has moderate LLQ and suprapubic tenderness. His WBC count is high and he has a fever. What organ do you think may be involved?
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http://www.learningradiology.com
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Retroperitoneum What organs are Retroperitoneal?
• Rocker • Kids • Party • Down with • AC • DC • Records
• Retroperitoneal Organs: • Kidneys • Pancreas • Duodenum • Ascending Colon • Descending Colon • Rectum
http://classes.kumc.edu/som/radanatomy
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Case 6 & 7 • Where would you expect to
find blood from kidney trauma? • Where would you expect to
find blood from liver trauma?
The liver is a peritoneal organ, so blood is commonly seen in the paracolic gutters.
Here there is blood in Morrison’s pouch (between liver and right kidney)
A patient injured in a motor vehicle crash with renal lacerations. There is hemorrhage that is loculated by the retroperitoneal septa.
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Summary • The main imaging modalities for the
abdomen are x-ray, ultrasound, CT, and MRI.
• The abdomen can be divided into four quadrants, each containing specific visceral organs.
• Abdominal organs can also be categorized as to whether are retroperitoneal.
• An understanding of the quadrant anatomy allows you to identify relevant pathology.
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THANK YOU!