[Vasculitides--introduction].

Area of Science:

• Immunology
• Pathology
• Rheumatology

Background:

• Vasculitis is a condition involving blood vessel inflammation and damage.
• It can lead to vessel occlusion and ischemic injury in organs.
• The pathogenesis is often considered autoimmune and can be primary or secondary.

Purpose of the Study:

• To define vasculitis as a clinicopathologic process.
• To highlight the autoimmune nature of vasculitides.
• To introduce the classification based on vessel size.

Main Methods:

• Clinicopathologic examination of blood vessel inflammation.
• Assessment of disease manifestation (primary/secondary) and organ involvement.
• Classification based on predominant vessel size affected (small, medium, large).

Main Results:

• Vasculitis is characterized by inflammation and damage to blood vessel walls.
• Vessel occlusion and subsequent ischemic damage to tissues/organs are common outcomes.
• Inflammation can compromise vascular integrity, affecting single or multiple organs.

Conclusions:

• Vasculitis encompasses a heterogeneous group of diseases.
• Autoimmune processes are strongly implicated in its pathogenesis.
• Classification by affected vessel size (small, medium, large) is a key diagnostic feature.