Ankylosing spondylosis - calcified sacrotuberous ligament
Chronic back pain, hip pain and perineal pain. HLA B27 positive, and diagnosed prior as ankylosing spondylosis.
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- Sclerosed bilateral sacroiliac joints.
- Pencil-like calcifications extending from sacrum to ischial tuberosities, suggesting sacrotuberous ligament calcification.
- Bilateral hip arthropathies.
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 recognize and mention this finding if demonstrated.
(Case courtesy: Dr. Abhijit Yadav, Dr. BL Yadav Imaging and research center, Satna)