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Category Radiology

Ankylosing Spondylitis

KEY FACTS Imaging Location Discs and synovial joints of spine Joints of axial skeleton, less commonly peripheral joints Tendon and ligament attachments (entheses) Sacroiliac joints: Bilaterally symmetric erosive arthropathy → fusion Facet, uncovertebral joints: Erosions → fusion Squaring of vertebral…

Hemodialysis Spondyloarthropathy

KEY FACTS Terminology Destructive spondyloarthropathy Discocentric destructive arthritis in patient on long-term hemodialysis Imaging Vertebral and endplate destruction in patient on long-term hemodialysis, ± vertebral collapse Cervical, thoracic, or lumbar spine Often involves multiple levels Endplate destruction with sharply marginated erosions…

Adult Rheumatoid Arthritis

KEY FACTS Imaging Erosions of dens, uncovertebral joints, facet joints Atlantoaxial instability in 20-86% patients with rheumatoid arthritis (RA) Atlantoaxial subluxation in 5% of cervical RA Cranial settling occurs in 5-8% of RA patients Lower cervical spine: Facet and uncovertebral…

Spondylolysis

KEY FACTS Terminology Defects in pars interarticularis thought to result from repetitive stress injury Pars is junction of pedicle, lamina, and facet Imaging Most common at L5: 80-90% Discontinuity in neck of “Scotty dog” on oblique plain films Elongation of…

Periodontoid Pseudotumor

KEY FACTS Terminology Calcium pyrophosphate dihydrate deposition disease (CPPD); articular chondrocalcinosis Crowned dens syndrome: Fever with cervicooccipital junction pain, stiffness with associated calcification of transverse ligament and nonenhancing retroodontoid soft tissue; associated with CPPD or hydroxyapatite deposition Pseudogout: Arthritis caused…