ALK and neoplasm: It was revealed on immunohistochemistry that the tumor showed positive immunoreactivity for vimentin, α-smooth muscle actin (α-SMA), and CD68 (Figure 3B, C, D), but was negative for anaplastic lymphoma kinase (ALK), S-100, CD34, CD117, kinesin-like protein-1 (KP-1), myelin basic protein (MBP), and desmin.