causes of ileitis
Infectious
Yersinia spp.
Salmonella spp.
Clostridium difficile
Typhlitis
Mycobacterium tuberculosis
Mycobacterium avium
Actinomycosis
Anisakiasis
Cytomegalovirus
Histoplasma capsulatum

Spondyloarthropathies
Ankylosing spondylitis
Reactive arthritis
Arthritis associated with inflammatory bowel disease
Psoriasis with arthritis

Undifferentiated spondylarthropathy
Vascular
Vasculitides
Systemic lupus erythematosus
Polyarteritis nodosa
Henoch-Schönlein purpura
Behçet’s disease
Other vasculitides: Churg-Strauss syndrome, rheumatoid arthritis vasculitis,
Wegener granulomatosis, lymphomatoid granulomatosis, giant-cell
arteritis, Takayasu arteritis, thromboangiitis obliterans

Ischemia

Small-bowel neoplasms
Cecal or small-bowel (ileal) adenocarcinoma
Lymphoma
Carcinoid tumor
Lymphosarcoma
Metastatic cancer

Drug-related
NSAID enteropathy
Other drugs: KCL tablets, parenteral gold therapy, oral contraceptives, ergotamine,
digoxin, diuretics, antihypertensives

Infiltrative
Eosinophilic enteritis
Sarcoidosis
Amyloidosis

Other causes
Backwash ileitis due to ulcerative colitis
Endometriosis
Radiation enteritis