Vasculitides are usually classified according to the size of the affected blood vessels and dominating inflammatory cells (neutrophilic leukocytoclastic, non-leukocytoclastic, lymphocytic, histiocytic). Small capillaries are affected in the group of diseases called progressive pigmented purpura or in stasis dermatitis, capillaritis can be found in a number of other diseases (e.g. gonococcal or meningococcal sepsis) and others. Diseases of large blood vessels (e.g. polyarteritis nodosa) are discussed elsewhere. Some of the vasculitic processes are granulomatous (e.g. Wegener's granulomatosis, arteritis temporalis of Horton).