Table 2

Underlying causes of stroke according to the macroscopic appearance of clots

Underlying causeMacroscopic appearanceP value
Red (n=233)White (n=22)
Atrial fibrillation120/233 (51.5)7/22 (31.8)0.078
Atherosclerosis49/233 (21.0)4/22 (18.2)0.75
Dissection13/233 (5.6)0/22 (0.0)0.61
Atypical etiology*11/233 (4.7)6/22 (27.3)0.001
 Cancer3/233 (1.3)†2/22 (9.1)‡
 Endocarditis0/233 (0.0)4/22 (18.2)
 Heart valve thrombus§1/233 (0.4)1/22 (4.5)
Unknown etiology40/233 (17.2)5/22 (22.7)
  • Values expressed as no/total no (%).

  • *In one patient with a white clot we observed both endocarditis and evolutive cancer (endocarditis was considered the main etiology).

  • †Evolutive cancer in three cases.

  • ‡Evolutive cancer in two cases.

  • §Observed in two patients with mechanical prosthetic valves (a third patient with a bio-prosthetic valve had no thrombus-on-valve).