Bilateral sacroiliitis - New York grade III

Case contributed by Bálint Botz
Diagnosis almost certain

Presentation

Known ankylosing spondylitis. Sacroiliitis?

Patient Data

Age: 50 years
Gender: Male

Bilaterally blurred sacroiliac joint line with periarticular sclerosis, and widening. Findings correspond to New York grade III sacroiliitis. 

Incidentally the left L5 transverse process is enlarged and forms a pseudoarticulation with the massa lateralis sacri (Castellvi IIa lumbosacral transitional vertebra). 

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