Nodular Vasculitis in a Patient With Crohn's Disease on Vedolizumab.

Erythema induratum (EI), or nodular vasculitis (NV), is a type of panniculitis that is often associated with vasculitis affecting various-sized veins, venules, and arteries in reaction to various causative factors. Historically, EI was highly linked to tuberculosis, but in 1946, Montgomery first proposed the term NV to describe cases of EI not associated with tuberculosis. Only 2 reports of NV associated with inflammatory bowel disease have been reported in the literature. The authors report a 60-year-old woman with Crohn's disease presenting with exacerbation of NV in the setting of vedolizumab therapy.