Which vasculitis affects both aerial and venous system?
**Core Concept**
The question is testing knowledge of the classification and characteristics of various types of vasculitis, which are inflammatory conditions affecting blood vessels. The correct answer is a type of vasculitis that involves both arterial and venous systems, making it distinct from other forms that primarily affect one system over the other.
**Why the Correct Answer is Right**
The correct answer is Polyarteritis Nodosa (PAN), a medium- and small-sized vessel vasculitis that affects both arteries and veins. PAN is characterized by the presence of necrotizing inflammation of the vessel walls, leading to damage to various organs, including the kidneys, gastrointestinal tract, and skin. The exact cause of PAN is unknown, but it is thought to be related to an autoimmune response to an unknown antigen. The condition typically presents with symptoms such as hypertension, kidney damage, and skin lesions.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because Giant Cell Arteritis (GCA) primarily affects large- and medium-sized arteries, particularly those in the head and neck. While it can cause systemic symptoms, it is not known to affect both arterial and venous systems.
**Option B:** This option is incorrect because Kawasaki Disease is a medium-sized vessel vasculitis that primarily affects children and young adults. It is characterized by fever, rash, swelling of the hands and feet, and lymphadenopathy, but it does not typically affect both arterial and venous systems.
**Option C:** This option is incorrect because Wegener's Granulomatosis (now known as Granulomatosis with Polyangiitis) is a small-sized vessel vasculitis that primarily affects the respiratory tract and kidneys. While it can cause systemic symptoms, it is not known to affect both arterial and venous systems.
**Option D:** This option is incorrect because Eosinophilic Granulomatosis with Polyangiitis (EGPA) is a small-sized vessel vasculitis that primarily affects the respiratory tract and skin. It is characterized by the presence of eosinophils and granulomas in the affected tissues, but it does not typically affect both arterial and venous systems.
**Clinical Pearl / High-Yield Fact**
PAN can be challenging to diagnose, as it often presents with non-specific symptoms and can be mistaken for other conditions, such as hypertension or kidney disease. However, a key diagnostic clue is the presence of multiple organ involvement, including the skin, kidneys, and gastrointestinal tract.
**Correct Answer:** C. Polyarteritis Nodosa.