sacro-iliitis, most probably due to ankylosing spondylitis. Other etiologies: psoriatic arthritis, Reiter's syndrome, enteropathic arthritis (IBD-associated), undifferentiated arthritis (all of these lead to sacro-iliitis frequently in HLA B27-positive patients).
Xray shows ................. ----- 'BAMBOO SPINE' lumbar vertebrae.............. ----- & INFLAMMATION [Increased Density] of the JOINTS between the SACRUM & ILEUM bones & vertebrae....................... My Dx: ANKYLOSING SPONDILYTIS ........ w/ concurrent SACROILITIS...... ------ Tnx ------