Preoperative imaging findings for Case 2. (a) Contrast-enhanced computed tomography image. T1-weighted axial (b) and T2-weighted sagittal (c) magnetic resonance images. Computed tomography and magnetic resonance images show a tumor with a clear margin and intralesional adipose tissue in the left lower neck. (d) Gross findings of the tumor. The tumor was encapsulated and had a smooth external surface.