A 12-year-old boy - uterus

[ArchivalUser]

is brought to the physician because of pain in his right leg for the past 3 weeks. The pain frequently occurs at night and is localized to the tibia, a few centimeters below the knee. The mother reports that the pain is promptly relieved by aspirin and that the child has had no fever. Examination reveals no tissue swelling or redness about the site of pain. X-ray films show radiolucent focus in the tibial cortex surrounded by marked bone sclerosis. Which of the following is the most likely diagnosis?

A) aneurysmal bone cyst
B) enchondroma
C) ewing sarcoma
D) osteoid osteoma
E) osteosarcoma

[ArchivalUser]

Answer------D-----????


Klebsiella

[ArchivalUser]

same here, why is it D), what about other choices?

[ArchivalUser]

hmm, aren't osteosarcoma and ewing sarcoma painful?

[ArchivalUser]

Osteoid osteoma is associated with production of Prostaglandins, hence exquisitely painful, and for the same reason, pain vanishes when aspirin is given, rest of the tumors produce dull aching pain coz of their mass and pressure effects.

[ArchivalUser]

aaa