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Fig. 6B —22-year-old man with palpable neck mass. Axial contrast-enhanced T1-weighted image depicts heterogeneously enhanced ovoid mass (arrow) between left carotid and prevertebral spaces. Surgical excision confirmed mass as schwannoma arising from left cervical sympathetic trunk. Two days after surgery, patient reported left ptosis and visual dimness, findings suggestive of left preganglionic Horner syndrome resulting from surgical trauma to cervical sympathetic trunk.