Primary tumors of vessels are very rare, but their preoperative localization may be easily accomplished by vascular contrast studies. The following case of hemangioma of the external jugular vein is believed to be the first in which the correct preoperative diagnosis of a primary tumor of the vessel was indicated, on the basis of its radiographic features. Case Presentation This 32-year-old white male presented with a painless nodular subcutaneous swelling, 1 cm in diameter, in the left lateral neck. He had first noticed this while shaving one week previously, and in the meantime there had been no drainage or change in size. There was no history of trauma. Positive physical findings were limited to the left neck. The nontender nodule, which was present about 4 cm above the medial left clavicle, was associated with moderate cephalad distention of the external jugular vein and was mobile in a lateral but not in a longitudinal direction. It maintained its relationship to the distended vein, and a plane betwe...