Bony mass associated with hypertrophy of the sternohyoid muscle after radical neck dissection

As a late complication after radical neck dissection, this paper reports a bony mass at the sternal end of the clavicle associated with hypertrophy of the sternohyoid muscle. The bony mass and hypertrophy of the muscle were considered due to continuous mechanical strain by the drooping of the shoulder caused by injury of the accessary and cervical nerves, left-handed physical labour, and the lack of the sternocleidmastoid muscle in rotating the head.