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Table 2 Distribution of MR imaging lesions in the SI joints (four quadrants), in the spine (four regions), in the shoulder/pelvic girdle and the anterior chest wall

From: Whole body MR imaging in ankylosing spondylitis: a descriptive pilot study in patients with suspected early and active confirmed ankylosing spondylitis

SI Joints: Inflammatory Lesions (four quadrants)
  Suspected Early AS Patients Confirmed AS Patients
  Patients Lesions Patients Lesions
Superior Ileal 2 2 5 8
Inferior Ileal 8 13 8 16
Superior Sacral 3 3 6 9
Inferior Sacral 6 8 10 15
SI Joints: Fatty Replacement of Bone Marrow (four quadrants)
  Suspected Early AS Patients Confirmed AS Patients
  Patients Lesions Patients Lesions
Superior Ileal 2 2 2 2
Inferior Ileal 3 4 6 10
Superior Sacral 3 3 6 9
Inferior Sacral 4 5 9 17
Spine: Inflammatory Lesions
  Suspected Early AS Patients Confirmed AS Patients
  Patients Lesions Patients Lesions
C-Spine (C2/3-C7/T1) 2 2 3 5
Upper T-Spine (T1/2-T6/7) 3 6 6 17
Lower T-Spine (T7/8-T12/L1) 7 15 9 21
L-Spine (L1/2-L5/S1) 4 5 8 18
Shoulder/pelvic girdle and anterior chest wall: Inflammatory Lesions
  Suspected Early AS Patients Confirmed AS Patients
Sternoclavicular Joint 1 2
Manubriosternal Joint 2 4
Costosternal Junction 1 0
Acromioclavicular Joint 0 3
Glenohumeral Joint 0 0
Subacromial Bursa 0 1
Hip Joint 4 3
Greater Trochanter 0 1
Symphysis Pubis 0 1