Ex 1 - Large Bowel Flashcards Preview

726 Imaging Interpretation > Ex 1 - Large Bowel > Flashcards

Flashcards in Ex 1 - Large Bowel Deck (11):
1

Normal rad appearance of Lg Bowel

- pattern of fine and evenly distributed gas bubbles
- "question mark"

2

Dog cecum - appearance

Corkscrew or C-shaped, right mid-abdomen

3

Cat cecum - appearance

short cone-shaped, usually can't see on survey rads

4

Longest segment of the large bowel?

Colon

5

Are contrast studies of the colon common?

No! Endoscopy and US have largely replaced rad contrast studies of the colon

6

Path of the Colon

Ascending colon
Right colonic flexure
Left colonic flexure (**)
Descending colon

7

Pneumocolon

Simple technique to help differentiate small from large intestine

Administer room air via catheter tipped syringe

8

Megacolon - pathology

- generalized enlargement of the colon
- consistently significantly larger than normal
- due to mechanical or functional obstruction
- characterized by diffuse colonic dilation with ineffective motility
- idiopathic or acquired

9

Causes of megacolon (6)

- Narrowing of the pelvic canal - after trauma (fractures)
- Strictures
- Neoplasia of colon wall
- External masses (prostrate, nodes)
- Spinal anomalies (Manx cats)
- Feline idopathic megacolon

10

Causes of megacolon, coned (5)

- chronic constipation and obstipation from nutritional, metabolic, or mechanical causes
- neuromuscular disorders (dysautonomia, Hirschsprung dz)
- Metabolic dz (hypokalemia, hypothyroid)
- perineal hernia
- anorectal congenital abnormalities

11

Is megacolon a diagnosis?

NO! Megacolon is a sign and rad finding --> need to find underlying cause