Table 2. Comparison of CT Findings in PAIS and PTE.
| CT Parameter | PAIS (n = 26) | PTE (n = 52) | P |
|---|---|---|---|
| Maximal longitudinal diameter (median, range, mm) | 45.5 (18–83) | 27.0 (10–76) | < 0.001 |
| Maximal transverse diameter (median, range, mm) | 22.0 (10–46) | 11.5 (5–32) | < 0.001 |
| Tumor extension pattern (%) | N/A | ||
| Cauliflower-like polypoid lesion | 4 (15.4) | 0 (0) | |
| Diffuse/focal wall thickening | 6 (23.1) | 8 (15.4) | |
| Tumoral impaction | 16 (61.5) | 3 (5.8) | |
| Tubular-polypoid shape | 0 (0) | 41 (78.8) | |
| Heterogeneity (%) | < 0.001 | ||
| Heterogeneous | 24 (92.3) | 0 (0) | |
| Homogeneous | 2 (7.7) | 52 (100) | |
| Attenuation (median, range, HU) | 71 (35–122) | 37.5 (4–89) | < 0.001 |
| WES (%) | 11 (42.3) | 0 (0) | < 0.001 |
| Bulging contour (%) | 24 (92.3) | 7 (13.5) | < 0.001 |
| Lobulating contour or surface nodularity (%) | 24 (92.3) | 4 (7.7) | < 0.001 |
| Intratumoral vessels (%) | 10 (38.5) | 0 (0) | < 0.001 |
| Interphase angle (%) | < 0.001 | ||
| Acute | 22 (84.6) | 9 (17.3) | |
| Obtuse | 4 (15.4) | 43 (82.7) | |
| RV strain (%) | 8 (30.8) | 19 (36.5) | 0.614 |
| Multifocality (%) | 0.002 | ||
| Multifocal | 11 (42.3) | 40 (76.9) | |
| Single | 15 (57.7) | 12 (23.1) | |
| Lung ischemia (%) | 13 (50.0) | 10 (19.2) | 0.005 |
| Location (%) | < 0.001 | ||
| Central | 22 (84.6) | 22 (42.3) | |
| Peripheral | 4 (15.4) | 30 (57.7) |
HU = Hounsfield units, RV = right ventricle, WES = wall eclipse sign