REPORT OF A CASE
A 25-year-old man sought advice for an asymptomatic swelling of 6 months' duration on the back of his lower left leg. He was otherwise in normal health. Local examination revealed a firm, relatively nontender subcutaneous swelling (diameter, 3 cm) in the lower third of the back of his left leg (Figure 1). The overlying skin was uninvolved and freely mobile. The swelling was continuous, both above and below, with a thickened linear cordlike structure felt for a short distance along the leg. Except for numbness of the left little toe, the peripheral pulses and movements at the ankle and knee joints were normal, with no muscular wasting. Examination of the skin, mucous membranes, and other systems revealed no abnormality.Laboratory tests showed the following results or values: hemogram, serum glucose, serum urea nitrogen, liver Figure 1. function, and chest roentgenogram, normal; and Mantoux test, diameter, 10