الفهرس 
GROSS ANATOMY OF THE SMALL INTESTINEOnly 14 pages are availabe for public view
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Abstract
rohn’s disease can be localized in every segment of the small bowel with a predilection for the terminal ileum. It affect approximately 500.000 to 2 millions people in the united states its importance return to it have no medical cure once begin they tend to fluctuate between periods of remission and relapse.
Most commonly begins during adolescence and early adulthood but it also can begin during childhood and later in life .men and women are equally affected.
Causes of Crohns disease exactly unknown but immune system problems, genetic and environmental factors are strongly involved .family history and smoking cigarettes, oral contraceptives are considered risk factors for Crohn’s disease.
The major advantage of MR enteroclysis over other techniques for detection of small bowel abnormalities is visualization of the complete small bowel and extra mural disease manifestations without the use of ionizing radiation. The imaging protocol enables identification of both the diagnosis and the extent of the disease. Functional information can be used to differentiate between collapsed normal bowel wall, active disease inactive disease, and bowel wall stenosis.
MRI with enteroclysis can be used as the initial imaging method for small-bowel diseases. The enteroclysis technique enables optimal distention of the small bowel, which results in accurate visualization of stenoses and obstructions. The high-volume-induced reflex atony leads to well-defined visualization of the bowel wall almost without peristalsis-induced artifacts. MR enteroclysis has shown excellent correlation with conventional enteroclysis in grading small-bowel obstruction and functional information while also providing transmural and extra mural visualization.