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Table 3 Histopathologic findings in definite diagnoses and non-specific synovitis

From: Synovial biopsy for establishing a definite diagnosis in undifferentiated chronic knee monoarthritis

Diagnosis

Synovial proliferation

Endothelial proliferation

Necrotic granuloma

Non-necrotic granuloma

Giant cells

Pannus formation

Neovascularization

Fibrosis

Hemosiderin deposition

Infiltrating cells

Non-specific synovitis

49 (94%)

51 (98%)

0 (0%)

2 (4%)

3 (6%)

37 (71%)

48 (92%)

45 (87%)

4 (8%)

43 (83%)

Crystal disease

1 (50%)

1 (50%)

0 (0%)

0 (0%)

0 (0%)

1 (50%)

1 (50%)

1 (50%)

1 (50%)

1 (50%)

Degenerative disease

4 (80%)

3 (60%)

0 (0%)

0 (0%)

0 (0%)

2 (40%)

3 (60%)

3 (60%)

0 (0%)

1 (20%)

Infectious disease

5 (83%)

4 (67%)

1 (17%)

0 (0%)

0 (0%)

3 (50%)

3 (50%)

4 (67%)

0 (0%)

6 (100%)

Infiltrative disease

0 (0%)

1 (100%)

0 (0%)

0 (0%)

1 (100%)

1 (100%)

1 (100%)

1 (100%)

0 (0%)

1 (100%)

Neoplasm

2 (40%)

2 (40%)

0 (0%)

0 (0%)

4 (80%)

0 (0%)

0 (0%)

1 (20%)

1 (20%)

0 (0%)

Rheumatoid arthritis

8 (100%)

8 (100%)

0 (0%)

0 (0%)

0 (0%)

8 (100%)

8 (100%)

7 (88%)

1 (13%)

7 (78%)

Trauma

1 (100%)

1 (100%)

0 (0%)

0 (0%)

0 (0%)

0 (0%)

0 (0%)

1 (100%)

1 (100%)

1 (100%)