Swollen Painful Neck: A Case of a Ruptured Venous Malformation.

A 16-year-old male was brought to our hospital presenting with acute onset of a painful protruding left neck mass within a day, associated with left upper-arm tenderness. Chest computed tomography revealed high attenuation masses at the left supraclavicular and mediastinal regions, suspected of being venous vascular tumors. Surgery was arranged and then ruptured venous tumor was noted, with pathology results determining a venous malformation.