Cutaneous polyarteritis nodosa.

The term polyarteritis nodosa (PAN) presently includes classic systemic PAN, cutaneous PAN, and microscopic PAN (microscopic polyangeiitis). Cutaneous PAN involves the deep dermis and the panniculus, with anatomopathological findings diagnostic for arteritis. The most frequent clinical manifestation of cutaneous PAN is the presence of nodules on the lower legs, which frequently are found at different stages of development.

The granuloma annulare phenotype and tuberculosis.

At one time it was believed that granuloma annulare was associated with or even caused by tuberculosis. In the past 50 years, that idea has seemed to be of little more than historic importance. A case is reported of chronic, inadequately treated tuberculosis with erythema induratum in which clinical and histologic lesions compatible with granuloma annulare occurred.