Bilateral symmetrical Sacroilitis is hallmark of :: (A) Ankylosing spondylitis, (B) Juvenile Rheumatoid ahritis, (C) Nail Patella syndrome, (D) Osteitis condensans ilii
Answer is A. Diagnostic radiological features of Ankylosing spondylitis are: Bilateral symmetrical Sacroilitis (earliest and most specific feature) Bamboo-spine (knobby spine, poker back or universal syndesmophytosis) is a characteristic feature of it. Syndesmophytes - ossifications of the outer fibers of annulus fibrosis. Enthesitis (earliest pathological change) Uncommon involvement of small joints of hand and feet.