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Histologic types of gut inflammation in patients with SpA
| Acute | Chronic |
| Architecture preserved | Architecture disturbed |
| PMN infiltration | Irregular, blunted and fused villi |
| Granulocytes, lymphocytes, plasma cells in lamina propria | Distortion crypts |
| Basal lymphoid follicles | |
| Sarcoid-like granulomas |
