Pseudo-Von Willebrand Disease, also known as von willebrand disease, platelet-type, is related to factor viii deficiency and thrombotic thrombocytopenic purpura. An important gene associated with Pseudo-Von Willebrand Disease is GP1BA (Glycoprotein Ib Platelet Subunit Alpha), and among its related pathways/superpathways are Response to elevated platelet cytosolic Ca2+ and Diseases of hemostasis. Affiliated tissues include bone marrow and bone, and related phenotypes are prolonged bleeding time and intermittent thrombocytopenia