Table 1
Detail classification of MRI findings.
| MRI FINDINGS | CLASSIFICATION | NUMBERS |
|---|---|---|
| Contour | Well-defined | 6 |
| Irregular | 3 | |
| Location | Superior portion | 7 |
| Inferior portion | 2 | |
| Inside muscle cone | 2 | |
| Outside muscle cone | 7 | |
| Signal intensity on T1WI | Hypo intensity | 0 |
| Hypo-Iso intensity | 2 | |
| Iso intensity | 4 | |
| Iso-Hyper intensity | 3 | |
| Hyper intensity | 0 | |
| Signal intensity on T2WI | Hypo intensity | 1 |
| Hypo-Iso intensity | 2 | |
| Iso intensity | 1 | |
| Iso-Hyper intensity | 4 | |
| Hyper intensity | 1 | |
| Linear of curvilinear hypo-intensity line | Present | 6 |
| Absent | 3 | |
| Enhancement | Homogenous | 6 |
| Heterogenous | 2 |
[i] T1WI (T1-weighted image), T2WI (T2-weighted image).
Figure 1
A 14-year-old woman with solitary fibrous tumor. (a) The tumor was located outside of the muscle cone and displayed isointensity compared with brain white mater on T1-weighted imaging. (b) The tumor displayed hyperintensity on T2-weighted imaging. (c) Hematoxylin and eosin staining of the tumor showing a prominent myxoid change.
Figure 2
A 77-year-old woman with solitary fibrous tumor (SFT). (a) The tumor was located outside of the muscle cone and showed marked isointensity on T1-weighted imaging. (b) The tumor displayed hypointensity on T2-weighted imaging. (c) Azan staining of the tumor revealing a large amount of collagenous tissue in the lesion.
Figure 3
A 69-year-old woman with solitary fibrous tumor (SFT). Inhomogeneous enhancement was observed on enhanced magnetic resonance imaging (MRI) (a). Although the level of CD31 staining was low (b).
Table 2
Correlation between amount of collagenous tissue and the parameters of texture analysis.
| AMOUNT OF COLLAGENOUS TISSUE | P VALUE | SPEARMAN’S RANK CORRELATION COEFFICIENT | |||||
|---|---|---|---|---|---|---|---|
| STATISTICS | PARAMETERS | 1 | 2 | 3 | 4 | P | ρ |
| Histogram | entropy | 0.092 ± 0.006 | 0.116 ± 0.016 | 0.078 ± 0.032 | 0.095 ± 0.029 | 0.95 | 0.03 |
| skewness | 0.178 ± 1.030 | 0.145 ± 0.597 | 0.109 ± 0.292 | 0.185 ± 0.311 | 0.62 | –0.20 | |
| kurtosis | 4.518 ± 0.866 | 3.309 ± 0.297 | 2.619 ± 0.022 | 2.504 ± 0.132 | <0.0001* | –0.97 | |
| mean | 120721± 18323 | 81868 ± 42632 | 119114 ± 42736 | 177961 ± 31071 | 0.181 | 0.4895 | |
| median | 120020 ± 15220 | 81090 ± 44357 | 119085 ± 44357 | 175631 ± 27137 | 0.181 | 0.4895 | |
| 0 percentile | 58395 ± 37998 | 28688 ± 30112 | 61838 ± 18212 | 84660 ± 44717 | 0.548 | 0.2319 | |
| 25 percentiles | 108099 ± 13912 | 70731 ± 46025 | 104550 ± 38947 | 154658 ± 29030 | 0.181 | 0.4895 | |
| 50 percentiles | 120020 ± 15220 | 81090 ± 44357 | 119085 ± 44357 | 175631 ± 27137 | 0.181 | 0.4895 | |
| 75 percentiles | 131771 ± 19874 | 92183 ± 41292 | 133652 ± 46836 | 200303 ± 31555 | 0.181 | 0.4895 | |
| 100 percentiles | 198390 ± 44906 | 131708 ± 27227 | 180540 ± 62027 | 266730 ± 40029 | 0.2703 | 0.4122 | |
| Co–occurrence matrix | contrast | 0.100 ± 0.009 | 0.149 ± 0.058 | 0.102 ± 0.095 | 0.118 ± 0.040 | 0.965 | –0.0172 |
| correlation | 0.951 ± 0.010 | 0.942 ± 0.023 | 0.910 ± 0.040 | 0.955 ± 0.001 | 0.4182 | –0.3092 | |
| energy | 0.975 ± 0.002 | 0.968 ± 0.006 | 0.984 ± 0.017 | 0.974 ± 0.010 | 0.9475 | –0.0258 | |
| homogeneity | 0.995 ± 0.000 | 0.993 ± 0.001 | 0.997 ± 0.004 | 0.994 ± 0.003 | 0.9475 | –0.0258 | |
| Run-length matrix | SLE | 0.409 ± 0.021 | 0.326 ± 0.029 | 0.439 ± 0.058 | 0.403 ± 0.092 | 0.7412 | 0.1288 |
| LRE | 65.445 ± 13.718 | 75.242 ± 40.237 | 68.610 ± 7.421 | 74.700 ± 7.116 | 0.5636 | 0.2233 | |
| GLN | 274.808 ± 38.795 | 467.219 ± 38.782 | 271.958 ± 25.069 | 332.819 ± 192.982 | 0.9825 | –0.0086 | |
| RP | 313.761 ± 15.303 | 307.426 ± 56.256 | 391.400 ± 99.577 | 307.451 ± 6.512 | 0.758 | 0.1202 | |
| RLN | 0.259 ± 0.008 | 0.327 ± 0.030 | 0.246 ± 0.047 | 0.275 ±0.082 | 0.9475 | 0.0258 | |
| LGRE | 0.442 ± 0.033 | 0.534 ± 0.001 | 0.395 ± 0.069 | 0.458 ±0.102 | 0.758 | –0.1202 | |
| HGRE | 20213 ± 383 | 15724 ± 1735 | 38253 ± 27746 | 19984 ± 6676 | 0.9475 | –0.0258 | |
| SRLGLE | 0.009 ± 0.002 | 0.010 ± 0.004 | 0.008 ± 0.005 | 0.011 ± 0.009 | 0.8433 | –0.0773 | |
| SRHGLE | 20211 ± 383 | 15722 ± 1735 | 38251 ± 27746 | 19982 ± 6676 | 0.9475 | –0.0258 | |
| LRLGLE | 20211 ± 383 | 15722 ± 1735 | 38251 ± 27746 | 19982 ± 6676 | 0.9475 | –0.0258 | |
| LRHGLE | 20432 ± 372 | 15932 ± 1588 | 38530 ± 27752 | 20225 ± 6712 | 0.9475 | –0.0258 | |
[i] * p < 0.05.
Four categories of the proliferation of collagenous fibers or fibrous components: (1), myxoid change (2), small amount of collagenous tissue (3), moderate amount of collagenous tissue and (4), abundant collagenous tissue.
SLE: Short-run emphasis, LRE: Long-run emphasis, GLN: Gray-level non uniformity, RP: Run percentage, RLN: Run length non-uniformity.
LGRE: Low gray-level run emphasis, HGRE: High gray-level run emphasis.
SRLGLE: Short-run low gray-level emphasis, SRHGLE: Short-run high gray-level emphasis, LRLGLE: Long-run low gray-level emphasis, LRHGLE: Long-run high gray-level emphasis.