Lecture 20: GI Radiology Flashcards
What is the search strategy for image interpretation of the abdomen?
- Solid organs: Liver, spleen, pancreas, adrenal glands, and kidney
- Gallbladder/biliary system
- Lymph node chains: hepatogastric lig, periportal region, mesentery
- Stomach, duodenum, rest of small bowel, colon
- Fat planes, abdominal wall, bones
In a T1-weighted vs T2-weighted MRI, how does fluid show up?
T1: fluid is dark
T2: fluid is bright (best for fluid)
Which structures on CT will show up best at level of T11?
Spleen, stomach, liver, aorta, IVC, inferior aspects of lung well defined
Which structures on CT will show up best at level of T12?
- Pancreas, spleen, kidney (particularly left)
- Gallbladder, portal triad
- Bifurcation of celiac trunk, possibly SMA, left renal vein, aorta, IVC
- View of small bowel, stomach
Identify this structure; seen best at what level?
Gastric fundus (stomach)
*Seen best at T11
Identify this structure; seen best at what level?
- Gallbladder
- Seen best at T12
Identify this structure; seen best at what level?
- Colon
- At T12
Which structures are seen at level of T12-L1?
- Pancreas, spleen, kidneys (particularly left)
- Gallbladder, portal triad, biliary tree
- SMA, left renal vein, aorta, IVC
- View of small bowel, left colon, duodenum
Identify this structure; seen best at which level?
- SMA
- T12-L1
Which strucutres are seen at level of L3-L4?
- Right kidney
- Gallbladder
- View of small bowel, ascending/descending colon, 3rd part of duodenum
- Abdominal and post-abdominal musculature well visulaized
Identify this structure; well visualized at what level?
- Psoas Muscle
- L3-L4
What is the modality of choice for diagnosing problems w/ the Biliary Tree?
- Endoscopic retrograde cholangiopanreatography (ERCP)
What is the imaging modality of choice for visualizing the abdominal aortic vasculature?
- Digital subtraction arteriography
What is the pathology seen here; causes?
- Ascites (fluid accumulation in abdomen)
- Liver cirrhosis, salt/water retention, heart failure, cancer
What is a mid-sagittal view in CT useful in identifying?
Useful in assessing the SMA and “Nutcracker” syndrome