Polyarteritis Nodosa: Old Disease, New Etiologies

Area of Science:

• Rheumatology
• Internal Medicine
• Pathology

Background:

• Polyarteritis nodosa (PAN) is a necrotizing vasculitis primarily impacting medium-sized arteries.
• Clinical manifestations are heterogeneous, often including systemic symptoms like fever and weight loss.
• PAN can affect multiple organs, with a predilection for skin, nervous system, and gastrointestinal tract.

Purpose of the Study:

• To provide a comprehensive review of Polyarteritis nodosa.
• To focus on the evolution of clinical manifestations in PAN.
• To highlight diagnostic distinctions and emerging associations of PAN.

Main Methods:

• Literature review of Polyarteritis nodosa.
• Analysis of clinical presentations and organ involvement.
• Examination of historical and current etiological associations.

Main Results:

• PAN characteristically involves medium-sized vessels but can affect smaller ones.
• Rare manifestations like orchitis can be specific to PAN.
• Distinguishing features include the absence of granulomas, glomerulonephritis, and ANCA.

Conclusions:

• PAN presents with diverse symptoms and potential for severe complications like hemorrhage and thrombosis.
• The link between PAN and Hepatitis B Virus (HBV) has diminished.
• Current research highlights associations between PAN, genetic syndromes, and neoplasms.