Normal GI Tract: Wall Thickness on CT
Organ Wall Thickness (mm)
Stomach 3 - 5 
Duodenum  < 3
Colon  < 3 

References:
1.  Desai RK, Tagliabue JR, Wegryn SA, Einstein DM.  CT evaluation of wall thickening in the the alimentary tract.  Radiographics 1991;11:771-783.
2.  Fisher JK.  Abnormal colonic wall thickening on computed tomography. J comput assist tomogr 1983; 7: 90-97.
In Siegel MJ.  Pediatric Body CT.  Lippincott Williams & Wilkins: Philadelphia.  1999. pp 204, 207, 219.

 
 

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