Platelet Function Disorders: Glanzmann Thrombasthenia and Type 2 Von Willebrand Disease

Disorders of hemostasis encompass a wide variety of conditions that interfere with the body’s ability to control bleeding. They are broadly classified into disorders of primary hemostasis, involving platelet adhesion, activation, and aggregation leading to platelet plug formation, and disorders of secondary hemostasis, involving abnormalities of the coagulation cascade and fibrin
formation.

Bleeding patterns often provide important diagnostic clues. Superficial bleeding manifestations such as epistaxis, gum bleeding, petechiae, and heavy menstrual bleeding are typically associated with platelet-related disorders. In contrast, bleeding into joints or muscles is more suggestive of coagulation factor deficiencies. However, despite important clues, a distinction between disorders
of adhesion, activation, and aggregation is unclear [2]. Although these defects have distinct pathological mechanisms, they commonly present with similar superficial bleeding symptoms, making clinical differentiation challenging. Specialized laboratory investigations are therefore essential to establish the correct diagnosis, as management strategies and long-term outcomes vary
among these disorders.

Glanzmann thrombasthenia is an inherited platelet function disorder characterized by defective platelet aggregation due to abnormalities in the glycoprotein IIb/IIIa integrin receptor evidenced by lack of in vitro coagulation to all soluble agonists [3]. Von Willebrand disease, the most prevalent inherited bleeding disorder, is inherited equally in men and women and arises from either reduced levels or impaired function of von Willebrand factor. Among its subtypes, type 2 disease is defined by qualitative defects that alter its functional activity.

Accurate differentiation between these conditions is essential, as their management strategies differ significantly. This report presents two cases that illustrate the diagnostic challenges encountered in adolescents presenting with mucocutaneous bleeding.