Table 2 Distribution of patients according to HRCT findings, CTPA data, and artificial intelligence CT opacity score

❖ Lobar involvement

Pulmonary embolism

❖ Right upper lobar

- Single

3 (4.1%)

❖ Present or absent

- Mean

2.2

- Multiple

70 (95.9%)

- Present

24 (32.9%)

- SD^a

1.22323

❖ Zonal distribution

- Absent

49 (67.1%)

❖ Right middle lobar

- Diffuse

50 (68.5%)

❖ Location

- Mean

2.3235294

- Basal

19 (26%)

- Main

1/24 (4.1%)

- SD

1.63062.

- Upper

4 (5.5%)

- Lobar

7/24 (29.1%)

❖ Right lower lobar

❖ Parenchymal changes

- Segmental

17/24 (70.5%)

- Mean

3.2909091

- GGO

67 (91.8%)

- Sub-segmental

21/24 (87.5%)

- SD

0.9138

- Crazy-paving

44 (60.3%)

❖ Laterality

❖ Left upper lobar

- Consolidations

62 (84.9%)

- Unilateral

8/24 (33.3%)

- Mean

2.2727273

- Cysts

6 (8.2%)

- Bilateral

16/24 (66.7%)

- SD

1.27609

❖ Pleural findings

Pulmonary HTN

❖ Left lower lobar

- Pleural effusion

6 (8.2%)

- Positive

14/73 (19.2%)

- Mean

3.0363636

❖ Mediastinal findings

Pulmonary infarcts

- SD

1.29495

- Enlarged lymph nodes

19 (26%)

- Positive

3/73 (4.1%)

❖ Total CT opacity score (20p)

- Pneumo-mediastinum:

1 (1.4%)

Vascular dilatation

⊠ 1–5/20

4 (5.5%)

- Inside (and/or) outside

57/73 (78.1%)

⊠ 6–10/20

14 (19.2%)

^a High TOS^a (46-81%), ^a low TOS (11–19%)

⊠ 11–15/20

28 (38.4%)

- Inside (+) outside

40/73 (54.8%)

⊠ 16–20/20

27 (37%)

^a High TOS (33–72%), ^a low TOS (7–18%)

- Pleural extension

45/73 (61.6%)

^a High TOS (40–89%), ^a low TOS (5–11%)

Vascular “tree in bud”

- Positive

10/73 (13.7%)