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6.1 Systemic Immune-Mediated Disease-Associated Scleritis: Vasculitides

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Fig. 6.11 Lumbosacral spine Þlm of patient with reactive arthritis, including ankylosing spondylitis. Note the complete obliteration of the right sacroiliac joint, with pronounced reactive sclerosis of the left sacroiliac joint due to bony ankylosis

In mild cases, years may elapse before unequivocal sacroiliac abnormalities are evident on plain radiographs. Computed tomography and magnetic resonance imaging (MRI) can detect abnormalities reliably at an earlier stage than plain radiography. Dynamic MRI with fat saturation, either short tau inversion recovery (STIR) sequence or T1-weighted images with contrast enhancement, is highly sensitive and speciÞc for identifying early intraarticular inßammation, cartilage changes, and underlying bone marrow edema in sacroiliitis. These techniques are also highly sensitive for evaluation of acute and chronic spinal changes.

6.1.3.5 Diagnosis

The diagnosis of AS depends on suspicion, history, clinical evaluation, and radiological conÞrmation. HLA-B27 typing cannot be used as a screening test because a majority of HLA-B27 individuals in the general population remains unaffected, and AS may occasionally occur in HLA-B27-negative individuals. Furthermore, most patients with AS can be readily diagnosed on the basis of clinical and radiological Þndings, and therefore do not need the HLA-B27 test. In cases of clinical suspicion of AS but with radiologic Þndings of sacroiliitis difÞcult to recognize

with certainty, the Þnding of HLA-B27 positivity increases the probability that the presumptive diagnosis is correct; however, it does not establish the diagnosis.

The widely used modiÞed New York Criteria (1984) are classiÞcation rather than diagnostic criteria, and they are insensitive in early or mild cases. These consist of the following: (1) a history of inßammatory back pain, (2) limitation of motion of the lumbar spine in both the sagittal and frontal planes, (3) limited chest expansion, and (4) deÞnite radiographic sacroiliitis. Criterion 4 plus any one of the other three criteria are sufÞcient for a diagnosis of deÞnite AS. Dynamic MRI is deÞnitely more sensitive than plain radiography. Although its exact sensitivity and speciÞcity remain to be deÞned, it is recommended in suspected cases in which plain radiography either fails to show deÞnite changes or is undesirable (e.g., in young women or children).

6.1.4Reactive Arthritis (Reiter)

Reactive arthritis follows certain enteric or genitourinary infections in genetically susceptible individuals.ReAmayfollowShigella,Salmonella,

Yersinia, or Campylobacter enteric infections

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