Sanjay Chawla, MD

Ultrasonography showed a large multiseptated cystic mass in the posterior part of the left side of the neck. No obvious vascular flow evident within the mass (Figures 3 and 4).

A 15-year-old Hispanic boy with refractory T-cell acute lymphoid leukemia was hospitalized because of fever and pain and swelling of the right knee of 3 days' duration. The patient was taking nelarabine for a recurrence of his leukemia, which was diagnosed a year earlier. He appeared nontoxic. His temperature was 39.28C (102.68F). Other vital signs were within normal limits. The right knee was warm and tender, with mild restriction of movement.