Table 5.

The type of pulmonary artery encasement that related to the calculation of the degree of encasement

Types of encasement	Benignancy (case number)	Malignancy (case number)
Type A	0	0
Type B	0	10
Type C	1	5
Type D	6	32
Amputation	1	11

Type A = The encased segment didn’t include any bifurcation, as in Figure 4A; Type B = The encased segment included one bifurcation, and the narrowest point was located proximate to the bifurcation, as in Figure 4B; Type C = The encased segment included one bifurcation, and the narrowest point was located distal to the bifurcation, as in Figure 4C; Type D = The encased segment included more than one bifurcation, as in Figure 4D.