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Erythema induratum (nodular vasculitis)

Maxwell A Fung, MD
Section Editor
Jeffrey Callen, MD, FACP, FAAD
Deputy Editor
Abena O Ofori, MD


Erythema induratum (EI) is an uncommon inflammatory disorder with alterations centered upon the subcutaneous fat tissue (panniculitis). The term "EI" was first proposed by Ernest Bazin in the mid-19th century, who recognized the association of the distinctive clinical and histologic changes with tuberculosis (TB) [1,2]. Subsequently, it was recognized that not all cases are associated with TB.

The three clinical subsets of EI are:

TB-associated EI

EI associated with other diseases or drugs

Idiopathic EI

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Literature review current through: Nov 2017. | This topic last updated: Nov 10, 2016.
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