A 60-year-old male presents with swelling and pain in the knee. CT reveals a tumor has devel-oped from a pre-existing benign bone lesion. This supports which diagnosis?
a. Secondary chondrosarcoma
b. Rhabdomyoma
c. Rhabdomyosarcoma
d. Fibrosarcoma
ANS: A
Chondrosarcoma is the second most common primary malignant bone tumor and is a tumor of middle-aged and older adults. Chondrosarcomas that develop from a pre-existing benign bone lesion are known as secondary chondrosarcomas. Rhabdomyoma is an extremely rare benign tu-mor of muscle that generally occurs in the tongue. The malignant tumor of striated muscle is called rhabdomyosarcoma. A fibrosarcoma is a solitary tumor that most often affects the met-aphyseal region of the femur or tibia.
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Insert >, <, or = to make a true statement: 
________ 
.
Fill in the blank(s) with the appropriate word(s).