“…Pelvic radiographs, bone scans and CT scan showed a localized lesion at the left sacroiliac joint. These methods of investigation give satisfactory results in the majority of patients with inflammatory disease [6,12], although they do not have the sensitivity to differentiate pyogenic from granulomatous sacroiliitis [5]. Therefore, in view of the laboratory findings, the positive tuberculin skin test, the lack of evidence of any underlying seronegative spondyloarthropathy and the CT scan findings, a needle biopsy was carried out and histological findings confirmed the diagnosis.…”