Pyoderma gangrenosum(PG) presents with refractory,sterile,deep ulcers most often on the lower legs.Clinically,PG exhibits four types,i.e.,ulcerative,bullous,pustular,and vegetative types.PG may be triggered by surgica...Pyoderma gangrenosum(PG) presents with refractory,sterile,deep ulcers most often on the lower legs.Clinically,PG exhibits four types,i.e.,ulcerative,bullous,pustular,and vegetative types.PG may be triggered by surgical operation or even by minor iatrogenic procedures such as needle prick or catheter insertion,which is wellknown as pathergy.PG is sometimes seen in association with several systemic diseases including rheumatoid arthritis(RA),inflammatory bowel disease,hematologic malignancy,and Takayasu's arteritis.In particular,various cutaneous manifestations are induced in association with RA by virtue of the activation of inflammatory cells(neutrophils,lymphocytes,macrophages),vasculopathy,vasculitis,drugs,and so on.Clinical appearances of ulcerative PG mimic rheumatoid vasculitis or leg ulcers due to impaired circulation in patients with RA.In addition,patients with PG sometimes develop joint manifestations as well.Therefore,it is necessary for not only dermatologists but also rheumatologists to understand PG.展开更多
文摘Pyoderma gangrenosum(PG) presents with refractory,sterile,deep ulcers most often on the lower legs.Clinically,PG exhibits four types,i.e.,ulcerative,bullous,pustular,and vegetative types.PG may be triggered by surgical operation or even by minor iatrogenic procedures such as needle prick or catheter insertion,which is wellknown as pathergy.PG is sometimes seen in association with several systemic diseases including rheumatoid arthritis(RA),inflammatory bowel disease,hematologic malignancy,and Takayasu's arteritis.In particular,various cutaneous manifestations are induced in association with RA by virtue of the activation of inflammatory cells(neutrophils,lymphocytes,macrophages),vasculopathy,vasculitis,drugs,and so on.Clinical appearances of ulcerative PG mimic rheumatoid vasculitis or leg ulcers due to impaired circulation in patients with RA.In addition,patients with PG sometimes develop joint manifestations as well.Therefore,it is necessary for not only dermatologists but also rheumatologists to understand PG.
