Fig. 1

a Contrast-enhanced computed tomography revealing a solitary nonhomogeneous 4-cm mass in the posterior mediastinum. b, c The mass invaded the left 2nd rib (black arrow). d, e Magnetic resonance imaging (MRI) showing that the signal inside the mass was representative of muscle tissues equivalent to that on the T1-weighted image and hyperintense on the T2-weighted image. f Contrast-enhanced MRI showing similar signal changes and contrast effects on the dorsal side of the second rib in contact with the tumor. Bone infiltration is noted (white arrow). g Positron emission tomography/computed tomography scan with F-18 fluorodeoxyglucose showing standardized uptake values of 2.69