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| | Case 1 | Case 2 |
|
| Age | 37 | 30 |
| Gender | Male | Female |
| Symptoms | | |
| | Inflammatory back pain and 20 minutes of morning stiffness | Inflammatory back pain, 2 hours of morning stiffness, and transient heel pain history |
| Laboratory findings | | |
| White blood cells (WBCs) (N: 4,100–11,000 cells/µL) | 6,700 | 6,700 |
| Neutrophils (N: 2,000–8,000 cells/µL) | 4,240 | 4,510 |
| Hemoglobin (Hgb) (N: 11–18 g/dL) | 13.02 | 12.7 |
| Hematocrit (HCT) (N: 35–55%) | 41.3 | 38.5 |
| Platelets (PLTs) (N: 150,000–400,000 cells/µL) | 146,000 | 208,000 |
| C-reactive protein (CRP) (N ≤ 3.48 mg/dL) | 6.71 | 5.56 |
| Erythrocyte sedimentation rate (ESR) (N: 0–20 mm/h) | 8 | 28 |
| Serum creatinine (sCR) (N: 0.67–1.17 mg/dL) | 0.81 | 0.54 |
| Aspartate transaminase (AST) (N: 0–50 U/L) | 16.9 | 19 |
| Alanine transaminase (ALT) (N: 0–50 U/L) | 19 | 11 |
| Total urinalysis findings | 1.011 density (N: 1.015–1.020), and other parameters were normal | 1.020 density (N: 1.015–1.020), 10 erythrocytes, and 42 leukocytes |
| The Rose Bengal test | Negative | Negative |
| Hepatitis B surface antigen (HBs-Ag) | Negative | Negative |
| Anti-hepatitis C virus (HCV) | Negative | Negative |
| Anti-human immunodeficiency virus (HIV) | Negative | Negative |
| Human leukocyte antigen- (HLA-) B27 | Negative | Negative |
| Imaging | | |
| | T1-weighted, fat-suppressed, gadolinium-enhanced MRI scan showed acute sacroiliitis | Pelvis anteroposterior radiograph showed right grade 3 sacroiliitis and left grade 2 sacroiliitis |
| | MRI scan indicated old Romanus lesions and polycystic kidneys | MRI scan indicated old Romanus lesions and polycystic kidneys |
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