Table II.

NTH aseptic lymphocyte-dominated vasculitis-associated lesion (ALVAL) grading system. The development of the grading system, interobserver reliability scores and comparison with other grading systems are described in the supplementary material

	Grade 0: ALVAL absent	Grade 1: Mild ALVAL	Grade 2: Moderate ALVAL	Grade 3: Severe ALVAL
Vascular cuffs	None	Yes	Large perivascular lymphocytic aggregates	Large confluent lymphocytic aggregates
Synovial membrane	Intact	Grade 0 or 1	Grade 2 or 3	Grade 4
Hyalinization	No	No	Can be present	Present
Germinal centres	No	No	Can be present	Present