32-year-old male with Burkitt's tumor or lymphoma and each IV. Palpable mass at level of left knee. In the posterior medial soft tissues at the level of the knee joint there is a complex cystic mass measuring 1.5 x 2.5 x 3.3 cm corresponding to the couple abnormality. There is no surrounding abnormality in the soft tissues and no obvious vascularity.
Baker's cyst left knee is the most likely consideration. Hematoma or abscess less likely possibilities.