Abdominal Imaging
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Transcript of Abdominal Imaging
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Abdominal Imaging
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The abdominal radiograph
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Why do we see any structure on a normal abdominal radiograph?
• It has to be surrounded by tissue of different attenuation (x-ray stopping power).
• we therefore see margins delineated by air (the mucosal surface of air filled bowel)
• Things outlined by fat (usually the kidneys. the psoas margins ,the bladder and the abdominal wall).
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We can only see
• gas
• soft tissue (effectively water density)-viscera, bowel and bowel wall, bladder.
• bone and calcium-stones, calcified lymph nodes,stones(90% renal, 10% gallstones)
• Fat
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Properitoneal fat
Transversus abdominis
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A FEW INTERESTING RADIOGRAPHS
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Gas outside the bowel .
Outling both the inside and outside of the bowel.
Free gas
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DILATED LARGE BOWEL WITH NO BOWEL WALL THICKENING
Turned out to be a sigmoid tumour.
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Gross large bowel wall thickening.
Secondary to ulcerative colitis
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Causes of colitis
• Inflammatory bowel disease
• Ischaemic colitis
• Pseudomembranous colitis
• Amoebic,schistosoma etc
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Gas outside the bowel .
Outling both the inside and outside of the bowel.
Free gas
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Aortic aneurysm
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Basic CT Anatomy
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mhv
rhv
IVC
anterior
posterior
right left
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gb
rk
ra
cl (1)
stomach
anterior
posterior
right left
spleen
pv
ha
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anterior
posterior
rightleft
rk
lk
pancreas
svd
cd
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Fluid in lesser sac
gallbladder
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Renal pelvisRenal artery
Renal vein
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uu
anterior
posterior
rightleft
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uu
anterior
posterior
Right left
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anterior
posterior
rightleft
u u
bladder
nav
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Left gastric A
Gastroduodenal A
Common Hepatic A
Splenic A
Pancreaticoduodenal A
Right gastric –small, from proper hepatic or Lt gastric
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Image of an aneurysm to discuss suitability
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