Table 3 Frequency of assessed imaging features in retroperitoneal extra-adrenal paragangliomas and schwannoma
From: MR imaging features of benign retroperitoneal paragangliomas and schwannomas
Imaging Feature | Reader 1 | Reader 2 | ||||
|---|---|---|---|---|---|---|
Paragangliomas (n = 24) | Schwannoma (n = 26) | P-value | Paragangliomas (n = 24) | Schwannoma (n = 26) | P-value | |
Location | ||||||
Right paravertebral region | 8.33(2/24) | 50(13/26) | 0.001 | 8.33(2/24) | 50(13/26) | 0.001 |
Left paravertebral region | 37.5(9/24) | 11.53(3/26) | 41.67(10/24) | 11.54(3/26) | ||
Prevertebral region | 54.17(13/24) | 23.08(6/26) | 50(12/24) | 23.08(6/26) | ||
Pelvic cavity | 0(0) | 15.38(4/26) | 0(0) | 15.38(4/26) | ||
Shape | ||||||
Round or oval | 83.33(20/24) | 92.31(24/26) | 0.589 | 87.5(21/24) | 84.62(22/26) | 1.000 |
Irregular | 16.67(4/24) | 7.69(2/26) | 12.5(3/24) | 15.38(4/26) | ||
Boundaries | ||||||
Well-defined | 66.67(16/24) | 88.46(23/26) | 0.063 | 70.83(17/24) | 84.62(22/26) | 0.240 |
Partly poorly defined | 33.33(8/24) | 11.54(3/26) | 29.17(7/24) | 15.38(4/26) | ||
Microscopic fat | ||||||
YES | 12.5(3/24) | 23.08(6/26) | 0.546 | 16.67(4/24) | 15.38(4/26) | 1.000 |
NO | 87.5(21/24) | 76.92(20/26) | 83.33(20/24) | 84.62(22/26) | ||
Subacute hemorrhage | ||||||
YES | 54.17(13/24) | 34.62(9/26) | 0.164 | 50(12/24) | 34.62(9/26) | 0.271 |
NO | 45.83(11/24) | 65.38(17/26) | 50(12/24) | 65.38(17/26) | ||
Necrosis | ||||||
YES | 75(18/24) | 34.62(9/26) | 0.004 | 70.83(17/24) | 34.62(9/26) | 0.010 |
NO | 25(6/24) | 65.38(17/26) | 29.17(7/24) | 65.38(17/26) | ||
Cysts | ||||||
YES | 62.5(15/24) | 92.31(24/26) | 0.011 | 66.67(16/24) | 96.15(25/26) | 0.019 |
NO | 37.5(9/24) | 7.69(2/26) | 33.33(8/24) | 3.85(1/26) | ||
Degree of tumor enhancemen | ||||||
Avid enhancement | 41.67(10/24) | 3.85(1/26) | <0.001 | 33.33(8/24) | 7.69(2/26) | <0.001 |
Moderate enhancement | 41.67(10/24) | 19.23(5/26) | 50(12/24) | 15.38(4/26) | ||
Slight enhancement | 16.67(4/24) | 76.92(20/26) | 16.67(4/24) | 76.92(20/26) | ||