True statements(s) regarding osteoid osteoma is/are -a) Malignantb) MC bone involvement-tibiac) Local excision or curettage cured) Bone pain relieved by aspirine) X-ray shows : density surrounding radiolucent lesion
**Core Concept**
Osteoid osteoma is a benign bone tumor characterized by its small size and distinct radiological features. It typically presents with night pain that is relieved by nonsteroidal anti-inflammatory drugs (NSAIDs), such as aspirin.
**Why the Correct Answer is Right**
The correct answer involves understanding the clinical presentation and radiological features of osteoid osteoma. The characteristic "nidus" of the tumor, which is a small area of radiolucency surrounded by a zone of sclerosis, is a key diagnostic feature. This is caused by the reactive bone formation that occurs in response to the tumor. The pain is thought to be due to the release of prostaglandins by the tumor, which are inhibited by NSAIDs.
**Why Each Wrong Option is Incorrect**
* **Option A:** Osteoid osteoma is a benign tumor, not a malignant one. It is characterized by its slow growth and non-aggressive behavior.
* **Option B:** The most common site of involvement is the long bones of the lower extremities, particularly the tibia and femur, but it can occur in any bone. The tibia is a common site, but not the most common.
* **Option C:** Local excision or curettage is a treatment option for osteoid osteoma, but it is not the only cure. Other treatment options include percutaneous radiofrequency ablation and NSAID therapy.
* **Option D:** While aspirin can relieve the pain of osteoid osteoma, it is not the only NSAID that can do so. Other NSAIDs, such as ibuprofen, can also provide relief.
**Clinical Pearl / High-Yield Fact**
Osteoid osteoma is a classic example of a "bone pain" tumor, where the pain is usually worse at night and relieved by NSAIDs. Remember the "nidus" of the tumor on X-ray, which is a small area of radiolucency surrounded by a zone of sclerosis.
**Correct Answer: C. Local excision or curettage is a treatment option for osteoid osteoma, and bone pain is relieved by NSAIDs such as aspirin.**