Week 10 - imaging of the GI tract Flashcards Preview

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Flashcards in Week 10 - imaging of the GI tract Deck (25):
1

From which view should an AXR be taken?

-A->P

2

What is the structure for interpreting an AXC?

-Air/gas
-Bowel
-Calcification and bones

3

When would the bowel not be visible?

-If it was entirely full of fluid

4

What are valvulae conniventes?

-Lines across the entire wall of the small intestine

5

How is the small intestine differentiated from the large on AXR?

-large -> haustra do not go all the way across
-small -> valvulae conniventes go all the way across

6

An obstruction is likely present when a small bowel loop is bigger than what size?

-3cm

7

An obstruction is likely present when a large bowel loop is bigger than what size?

-9cm

8

How does sigmoid volvulus often look on an AXR?

-Coffee bean sign in left iliac fossa

9

What causes toxic megacolon? How does it present on AXR?

-Infection
-Chronically dilated with pseudopolyps

10

Lead pipe colon is a sign of what?

-UC

11

What is thumb printing?

-Odematous thickened haustra

12

What soft tissues should be identified on an AXR except bowels?

-Liver, spleen, stomach, kidneys

13

When would you do an erect CXR?

-Pneumoperitoneum

14

Name 4 possible causes of pneumoperitoneum

-Peptic ulcer
-Diverticular
-Tumour
-Obstruction

15

What is the major disadvantage to CT?

-Very high dose of radiation

16

What does CT require?

-IV contrast and knowledge of anatomical levels

17

MRIs have no radiation and give the best spatial resolution. Why is it then that they are not always used?

-Time consuming
-Anything which moved proves problematic eg small bowel, unwell patient

18

What is the major disadvatage to abdominal USS?

-Highly user dependant

19

What are the advatages to abdominal USS?

-Cheap
-Fast
-Portable

20

What is indicative of chronic prancreatitis on AXR?

-Retroperitoneal calcificaton

21

Describe a barium swallow

-Oesophagus visualised as barium is swallowed in upright and prone positions
-Allow visualisation of motility abnormalities and anatomical lesions

22

When is a barium meal used?

-To visualise stomach and duodenum

23

When is a barium follow through used?

-To visualise small bowel

24

When is the best time to use USS?

-Fluid filled lesions

25

Name the most common reasons for a request of AXR

-Acute pain
-Obstruction
-Renal colic