A malignant tumor of childhood, that metastsizes to bones most often, is
The options aren't listed, but the correct answer is supposed to be Ewing sarcoma. Wait, but maybe it's osteosarcoma? No, osteosarcoma is a primary bone tumor, not a metastasizing one. Then there's neuroblastoma, which is a common pediatric cancer. I remember neuroblastoma often spreads to bones, especially in younger children. Let me think. Neuroblastoma arises from neural crest cells and is one of the most common extracranial solid tumors in kids. The most common sites for metastasis are bones and bone marrow. Osteosarcoma is a primary bone tumor, so it doesn't metastasize from another site. Ewing sarcoma is another primary bone tumor, similar to osteosarcoma. Wilms tumor is a kidney cancer and may spread to lungs or liver but not bones. So the correct answer here should be neuroblastoma.
Wait, but the question says "malignant tumor of childhood that metastasizes to bones most often." So the primary tumor is elsewhere and spreads to bones. Neuroblastoma is an example. Osteosarcoma is a primary bone tumor, so it's not the right answer. So the correct answer is neuroblastoma. Let me confirm. Yes, neuroblastoma is a common pediatric cancer that frequently metastasizes to bones. So the answer is Neuroblastoma. The options were probably Neuroblastoma, Osteosarcoma, Ewing Sarcoma, Wilms Tumor. So the correct answer is Neuroblastoma.
**Core Concept**
The question tests knowledge of pediatric malignancies with a predilection for bone metastasis. Neuroblastoma is a common extracranial solid tumor in children, known for its high metastatic potential to bones and bone marrow due to its neural crest origin.
**Why the Correct Answer is Right**
Neuroblastoma, arising from undifferentiated sympathetic nervous system cells (neural crest), frequently metastasizes to bones via hematogenous spread. Bone pain, lytic lesions, and pathological fractures are classic features, especially in younger children. It is the most common solid tumor in infants and a leading cause of cancer-related death in early childhood.
**Why Each Wrong Option is Incorrect**
**Option A: Osteosarcoma** – A primary bone tumor, not a metastasizing one; it originates in bone and spreads to lungs, not vice versa.
**Option B: Ewing Sarcoma** – Another primary bone tumor; it metastasizes to lungs and bones but is less common than neuroblastoma in pediatric bone metastasis.
**Option C: Wilms Tumor** – A renal tumor that metastasizes to lungs and liver, not bones.
**Clinical Pearl / High-Yield Fact**
Neuroblastoma is the most common pediatric cancer to cause bone marrow involvement and skeletal metastases. Remember the "rule of 2s": it occurs in children under 2, and 2% are spontaneous regressions. Bone imaging (e.g., bone scan) is critical for staging.
**Correct Answer: D. Neuroblastoma**