Table 3.
Ultrasound results, additional tests and final diagnosis in each category
| GCA risk category (n) | Vascular ultrasound | No. of AT (%) |
Type of AT | Final diagnosis | ||
|---|---|---|---|---|---|---|
| Positive (%) | Not done (%) | Negative (%) | ||||
| Low (151) | 3 (2) |
70 (46) |
78 (52) |
8 (5) |
1×TAB (−), CTB (−) | Fibromyalgia |
| 1×TAB (−), MRA (−) | Tongue cancer | |||||
| 1×CTA (+) | Stroke | |||||
| 1×CTA (−) | Inflammatory arthritis | |||||
| 1×PET (−) | PMR | |||||
| 2×TAB (−) | Non-arteritic AION | |||||
| 1×PET (−) | Stroke | |||||
| Intermediate (137) | 39 (28) |
30 (22) |
68 (50) |
23 (17) |
1×TAB (−), MRA (+) | Stroke |
| 1×PET (+) | Lymphoma | |||||
| 11×TAB (−) 3×PET (−) |
No definite diagnosis | |||||
| 1×TAB (+) 6×PET (+) |
GCA | |||||
| High (66) | 52 (79) |
4 (6) |
10 (15) |
15 (23) |
1×TAB (−) | Non-arteritic AION |
| 1×PET (+) | Breast cancer | |||||
| 3×PET (−) 2×TAB (−) |
No definite diagnosis | |||||
| 2×PET (+) | GCA | |||||
| 1×TAB (+) | ||||||
| 1×CTA (+) | ||||||
| 1×MRA (+) | ||||||
| 1×PET (−) | ||||||
| 1×TAB (−) | ||||||
| 1×CT CAP (−) | ||||||
AION, anterior ischaemic optic neuritis; AT, additional tests; CTA, CT angiography; CTB, CT of brain; CT CAP, CT of chest, abdomen and pelvis; GCA, giant cell arteritis; MRA, magnetic resonance angiography; PET, position emission tomography; TAB, temporal artery biopsy; UTI, urinary tract infection; the symbols + and - refer to test positivity or negativity to, respectively, include or exclude the final diagnosis.