Pyogenic sacroiliitis is a rarely occurring disease.

化脓性骶髂关节炎是一种很少发生的疾病。

Impression and recommendations: There is bilateral sacroiliitis with features of osteoarthritic disease.

印象及建议：有骨关节炎特征的双侧骶髂关节炎。

Often the first symptom of ankylosing spondylitis is sacroiliitis, or inflammation of the sacroiliac joints at the base of the spine.

通常，强直性脊柱炎最初的症状是骶髂关节炎，即脊柱底部骶髂关节的炎症。

This radiograph of the pelvis of a patient with ankylosing spondylitis shows bilateral sacroiliitis with sclerosis and narrowing of the sacroiliac joints.

这是一个强直性脊柱炎患者的骨盆正位片，显示双侧骶髂关节炎，伴随硬化与关节间隙狭窄。