MRI of the neck. Axial view. Gray arrow: well-circumscribed, highly-vascularized mass with dimensions of 3.5 x 3.5 x 1.6 cm in the right lateral cervical region directly under the right sternocleidomastoid muscle, separating the internal jugular vein and the carotid artery. Yellow arrow: compressed internal jugular vein. Black arrow: carotid artery. MRI: magnetic resonance imaging