A 25-YEAR-OLD WOMAN presented with a progressively enlarging mass in the left side of the supraclavicular fossa. There were no associated symptoms. A fixed, nontender, hard mass measuring 2 cm in diameter was found in the left supraclavicular region. The results of examination of the head and neck, chest, upper limbs, and abdomen were unremarkable. Chest x-ray films are shown in Figure 1 and Figure 2.