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1990 Classification
Tree for Giant Cell (Temporal) Arteritis (GCA)
GCA subsets
- 7. Age ≥50 at
disease onset and tenderness or decreased temporal artery pulsation
- 5. Age ≥50 at
disease onset and artery biopsy showing mononuclear cell or granulomatous
inflammation, with clinically normal temporal arteries
- 3. Age ≥50 at
disease onset, claudication, normal temporal arteries and negative biopsy
Non-GCA
- 1. Vasculitis, with
normal temporal arteries, no claudication, and negative biopsy
- 2. Vasculitis, age <50
at disease onset, claudication, normal temporal arteries, and biopsy without
specified findings
- 4. Vasculitis, age <50
at disease onset, clinically normal temporal arteries, and biopsy with specified
findings
- 6. Vasculitis, with
abnormal temporal arteries, age <50 at disease onset
* The
subset numbers also appear below the subset boxes in Figure 1. Missing data
rules: If temporal artery findings are not available, substitute scalp tenderness;
if biopsy findings are not available, substitute headache; if other findings
are not available, the vasculitis cannot be classified. The classification tree
yields a sensitivity of 95.3% and a specificity of 90.7%. See Table 4 for definitions
of criteria.
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