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. 2016 Jun;6(2):145–154. doi: 10.1086/686011

Table 1.

Jamieson classification system of pulmonary endarterectomy specimens23,24

Description Frequency, %
Type 1 Semiorganized or organized thrombus beginning in the main or lobar arteries 22.9
Type 2 Organized thrombus and intimal thickening in the proximal to segmental arteries 39.0
Type 3 Intimal thickening and fibrosis in the distal segmental and subsegmental arteries 33.7
Type 4 Distal arteriolar vasculopathy with no intraluminal disease 4.3