Achenbach Syndrome, also known as paroxysmal hematoma of the finger, is related to vascular disease and purpura. An important gene associated with Achenbach Syndrome is EDNRA (Endothelin Receptor Type A), and among its related pathways/superpathways are Collagen chain trimerization and Diseases of hemostasis. Affiliated tissues include skin, and related phenotypes are muscle and cardiovascular system