What term refers to the abnormal layer of vascular granulation tissue found in synovial joints?

The term that refers to the abnormal layer of vascular granulation tissue found in synovial joints is "pannus." This tissue typically develops in response to inflammation, often associated with conditions like rheumatoid arthritis. The presence of pannus can lead to further joint damage as it invades and erodes the cartilage and underlying bone, contributing to the pain and dysfunction experienced by individuals with such inflammatory joint diseases.

Pannus formation is characterized by its vascular nature and its ability to proliferate over the articular surfaces, which is a distinguishing feature of this abnormal tissue. Understanding this term is crucial in the context of diseases affecting the synovial joints, as it connects directly to the pathology and potential treatments for conditions characterized by chronic inflammation and joint degradation.