Figure 1 All lymph nodes were divided into three groups based on CT findings according to characteristics of density within lymph nodes. (A) Lymph node (arrowhead) has a homogeneous density on the axial CT scan. (B) Lymph node (arrowhead) has a heterogeneous density on the axial CT scan. (C) Lymph node (arrowhead) has a central nodal necrosis on the axial CT scan