MRI
Left supra and infra-clavicular large well-defined mass lesion eliciting high signal on T1 & T2 WI showing signal suppression on fat sta sequences. It also shows fine internal septations which show mild post-contrast enhancement. The mass is smoothly abutting and displacing the adjacent muscles. It smoothly displaces the patent left carotid and jugular vessels medially. It completely encases the left axillary vessels which are also patent.
Bilateral few prominent reactive deep cervical lymph nodes.
Prominent thymic gland (Normal for age)