Ankylosing spondylosis - calcified sacrotuberous ligament
Chronic back, hip, and perineal pain. HLA-B27 positive. Previous diagnosis of ankylosing spondylitis.
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- sclerosed bilateral sacroiliac joints
- pencil-like calcifications extending from sacrum to ischial tuberosities, suggesting sacrotuberous ligament calcification
- bilateral hip arthropathy
One of the significant complications, apart from sacroilitis, in cases of ankylosing spondylosis is calcification of sacrotuberous and sacrospinous ligaments. This can cause pudendal canal entrapment, resulting in chronic perineal pain. It is important to recognizs and mention this finding if demonstrated.
Case courtesy: Dr. Abhijit Yadav, Dr. BL Yadav Imaging and Research Center, Satna