Statements of authors about the type and the site of vessels affected in LV are summarized in Table 1. It can be seen easily that authors agree neither on the type of vessel nor on the site of involvement. Controversy exists especially in regard to involvement of arterioles and about vessels in the subcutis being affected. Many authors gave only incomplete information in regard to which type of vessel they considered to be affected mostly.

Whereas authors agree on the presence of thrombi within the lumen of vessels and deposits of fibrin in the walls of vessels, they disagree on the amount and the composition of an accompanying infiltrate. Almost all authors, however, acknowledge the presence of some inflammatory cells around vessels, even though less dense than in a stereotypical example of leukocytoclastic vasculitis.