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THe differential diagnosis for CD is very broad indeed.  If one takes
classic malabsorptive CD then the differential includes the follwing not
exclusive list
Giardiasis
Common variable hypogammaglobulinemia
IgA def
Crohn's disease
Whipple's disease
Cow milk allergy( in kids)
Pseudoobstruction
Ischemic bowel
Scleroderma of the small intestine
intestinal diverticulosis
rare cangenital defects in the mucosa
Bacterial overgrowth syndromes
Pancreatic failure
Effects of some drugs
HIV enteropathy
protein losing enteropathy( lymphangiectasia)
The list goes on forever.
Most can be distinguished on biopsy and with other tests but this is a
very complex part of the body and not very accessible to examination
Some of these can coexist with CD
If one considers all of the possible presentations of CD then there is
even wider number of possibilities.
Joe Murray
**Not medical advice**