1 | Major vessel clot | Yes |
Readily visible on opening pulmonary arteries |
20% of cases |
2 | Only thickened intima can be seen | Yes |
Endarterectomy plane initially raised in the main, lobar or segmental vessels |
∼70% of cases |
3 | Distal disease | Yes |
Confined to segmental and subsegmental branches |
∼10% of cases |
4 | Intrinsic small-vessel disease | No |
Secondary thrombi may occur from stasis |