A 16-year-old male patient presents in the emergency room with a pathologic fracture of the left femur and complains of pain on weight bearing. These are cardinal indicators of:
a. osteogenic sarcoma.
b. osteoporosis.
c. rheumatoid arthritis.
d. osteochondroma.
ANS: A
Osteogenic sarcoma occurs in young men aged 10 to 25. They are malignant bone tumors that can cause a pathologic fracture and they are accompanied by pain on weight bearing. Osteochondromas are benign and usually do not cause fractures.
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