A malignant tumor of childhood, that metastasizes to bones most often, is –
**Core Concept**
The question tests knowledge of **pediatric oncology**, specifically the types of malignant tumors that commonly metastasize to bones in children. **Neuroblastoma**, **rhabdomyosarcoma**, and **Ewing's sarcoma** are notable examples, but one stands out for its propensity to spread to bones.
**Why the Correct Answer is Right**
**Neuroblastoma** is a malignant tumor that arises from **neuroblasts** in the **sympathetic nervous system**, often presenting in the **abdomen** or **thorax**. It has a high propensity to metastasize to **bones**, particularly the **skull**, **orbits**, and **long bones**, due to its ability to spread through the **bloodstream** and **lymphatic system**.
**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because, although it's a pediatric tumor, it doesn't metastasize to bones as frequently as neuroblastoma.
**Option B:** Incorrect as it's more commonly associated with **soft tissue** and **lymph node** metastases.
**Option C:** Incorrect because, while it can metastasize, its primary sites and patterns differ from those of neuroblastoma.
**Why Each Wrong Option is Incorrect (Continued)**
**Option D:** Incorrect, as this tumor type is less common in children and has a different metastatic pattern.
**Clinical Pearl / High-Yield Fact**
Remember that **neuroblastoma** is one of the most common **extracranial solid tumors** in children, with a high propensity for **bone metastasis**, particularly to the **skull** and **orbits**, which can cause **proptosis** and **periorbital ecchymosis**.
**Correct Answer:** Correct Answer: D. Neuroblastoma.