The parents of an 8-yr old boy complained of frequent severe bleeding on minor trauma The patient could be suffering from
**Core Concept**
The patient's symptoms suggest a bleeding disorder characterized by impaired platelet function or coagulation pathway defects, leading to uncontrolled bleeding on minor trauma. This condition can result from inherited or acquired factors affecting the coagulation cascade, platelet aggregation, or vascular integrity.
**Why the Correct Answer is Right**
The patient's presentation is most likely due to Hemophilia A, a genetic disorder caused by a deficiency of factor VIII, a crucial protein in the intrinsic coagulation pathway. Factor VIII acts as a cofactor for factor IXa in the activation of factor X to factor Xa. The absence or deficiency of factor VIII leads to an increased risk of bleeding, especially after minor trauma. The severity of bleeding is often correlated with the degree of factor VIII deficiency.
**Why Each Wrong Option is Incorrect**
**Option A:** von Willebrand disease is another bleeding disorder but is more commonly associated with mucocutaneous bleeding (e.g., nosebleeds, easy bruising) rather than severe bleeding on minor trauma. It's caused by a deficiency of von Willebrand factor, which also plays a role in platelet adhesion.
**Option B:** Platelet function disorders, such as Glanzmann's thrombasthenia, primarily affect platelet aggregation and are characterized by mucocutaneous bleeding, not severe bleeding on minor trauma.
**Option C:** Hemophilia B, caused by a deficiency of factor IX, is another genetic bleeding disorder but typically presents with more severe symptoms and a higher risk of bleeding, especially into joints.
**Clinical Pearl / High-Yield Fact**
Hemophilia A and B are X-linked recessive disorders, meaning they predominantly affect males due to their single X chromosome.
**Correct Answer:** C.