Presentation of Case An 84-year-old man was admitted to the hospital because of a mass in the left leg. The patient was in stable health until three years earlier, when he became aware of a mass in the left popliteal space. A physician aspirated the mass 21/2 years before admission and made a diagnosis of a cyst, but the mass later increased in size. Several months thereafter the mass was again aspirated and was called a “cyst” but continued to enlarge during the next six months. Seven months before entry the patient consulted an orthopedic surgeon, who advised that no.
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