Abdomen radiology Flashcards
what can cause large bowel obstruction?
cancer, strictures from previous surgery etc
what is rigger’s sign?
well defined double wall of the bowel- indicates that air is surrounding both sides of the bowel wall
what do we call air under the diaphragm,?
pneumoperitoneum
what is the maximum diameter of small bowel, large bowel and caecum?
3 cm, 6cm and 9cm respectively
why would we worry about air under the diaphragm?
indicates bowel perforation or post surgical
what are some complications of diverticular disease?
- Perforation
- abscess formation
- strictures
what is the difference between diverticulosis and diverticulitis?
diverticulosis= many diverticulum Diverticulitis= inflammation
what are some causes of small bowel obstruction?
adhesions, IBD- strictures, tumour, lymphoma, incarcerated hernias etc
what are the 3 signs of cholecystitis on U/S?
- Ultrasound + murphy’s sign (press on gallbladder)
2. gall bladder wall thickening >3mm - pericholecystic fluid
what might you think if you saw a diffusely hyper echoic liver on U/S? as well has a hyper dense liver on CT?
fatty liver
what is the difference between bacterial abscess and amoeba abscess on CT liver?
bacterial abscess appears more multifocal than an amoebic abscess that appears more uninocular and homogenous
what phase do you see HCC best in on CT?
arterial phase
how do you tell the difference of SBO and LBO on X-rays?
plicae circularis for SBO and haustra for LBO. Hausfrau lines do not go all the way through
