Imaging Approach to the Small Intestine


Serosa
Longitudinal muscle
Circular muscle
Submucosa
Mucosa
(Top) There are 5 layers of the bowel wall. The innermost is the mucosa, the absorptive surface of the gut. The other layers are the submucosa, circular muscle, longitudinal muscle, and serosa.


image
Lymphoid nodule
Muscularis mucosa
Circular fold & lamina propria
Villi
Submucosa
Circular muscle
Longitudinal muscle
(Bottom) The mucosal surface of the jejunum is increased by prominent villi, which are finger-like projections of mucosa. The submucosa has a network of capillaries, lymphatics, and a nerve plexus. The jejunum has few small, discrete lymphoid nodules. Although there is no sharp point of transition between the jejunum and ileum, the wall of the ileum becomes thinner and less vascular, with shorter and more widely spaced transverse folds, and more prominent lymphoid follicles.


image
(Left) CT of a man with abdominal distention months after stem cell transplantation shows extensive pneumatosis image, but no ascites or ileus. These findings, along with no clinical evidence for bowel ischemia, correctly suggested benign, medication-induced pneumatosis.

image
(Right) Axial CECT shows diffuse SB wall thickening, with near water density submucosal edema, and intense mucosal enhancement in a patient with “shock bowel” following abdominal trauma. This is a form of reversible bowel ischemia.

image
(Left) CT of a young woman with acute onset of abdominal pain shows wedge-shaped and striated zones of decreased attenuation image within the kidneys.

Only gold members can continue reading. Log In or Register to continue

Related posts:

Rectal Prolapse and Intussusception Cecal Volvulus Biloma Congenital Hepatic Fibrosis Choledochal Cyst Crohn Disease

Stay updated, free articles. Join our Telegram channel
Tags:
Nov 16, 2016 | Posted by in GASTROINTESTINAL IMAGING | Comments Off on Imaging Approach to the Small Intestine

Full access? Get Clinical Tree
Get Clinical Tree app for offline access