Vasculitis involving muscle associated with Crohn's colitis

Area of Science:

• Gastroenterology
• Rheumatology
• Dermatology

Background:

• Crohn's disease is a chronic inflammatory bowel disease.
• Extraintestinal manifestations are common in Crohn's disease.
• Muscle vasculitis is a rare complication.

Observation:

• A patient with Crohn's colitis presented with erythema nodosum, pyoderma gangrenosum, and oral ulcerations.
• The patient simultaneously developed an unusual vasculitis affecting small muscle vessels.
• Histopathology revealed necrosis and polymorphonuclear leukocyte infiltration, suggestive of leukocytoclastic vasculitis.

Findings:

• Immunofluorescence showed strong antihuman C3 deposition in affected vessel walls.
• Circulating IgG immune complexes were not detected in serum via Raji cell assay.
• Leukocytoclastic vasculitis was identified in muscle tissue.

Implications:

• This case highlights an unusual association between Crohn's colitis and muscle leukocytoclastic vasculitis.
• The findings may expand the understanding of Crohn's disease-related vasculitis.
• Further research is needed to elucidate the pathogenesis and clinical significance.