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In a medical context, "pannus" refers to exaggerated tissue overgrowth, particularly associated with certain inflammatory conditions such as rheumatoid arthritis. It typically describes a layer of vascular connective tissue that invades and erodes the cartilage and bone in affected joints. The term is often seen in discussions about joint disease because the presence of pannus can lead to significant destruction of joint structures, ultimately affecting mobility and function.

This understanding of pannus as tissue overgrowth is crucial for diagnosing and managing conditions that involve inflammatory processes and aberrant tissue repair mechanisms. Recognizing the characteristics and implications of pannus can guide clinicians in treatment decisions and help predict disease progression.