Treatment of choice for stage 4S neuroblastoma is
**Core Concept**
Stage 4S neuroblastoma, also known as "special infantile neuroblastoma," is a rare and favorable variant of neuroblastoma that occurs in infants less than 1 year of age. It is characterized by a unique combination of clinical and biological features, including a small primary tumor and widespread dissemination of tumor cells through the skin, bone marrow, or liver, but without metastasis to lymph nodes or other organs.
**Why the Correct Answer is Right**
The treatment of choice for stage 4S neuroblastoma is observation or minimal treatment, as these tumors often regress spontaneously. The primary treatment strategy is to avoid aggressive therapy, which can lead to long-term sequelae. The rationale behind this approach is to take advantage of the tumor's natural tendency to regress, while minimizing the risk of treatment-related complications. In some cases, chemotherapy or surgery may be considered, but only if the tumor is causing significant symptoms or is unlikely to regress on its own.
**Why Each Wrong Option is Incorrect**
* **Option A:** Chemotherapy is not the primary treatment for stage 4S neuroblastoma, as these tumors often respond poorly to chemotherapy and may experience long-term toxicity.
* **Option B:** Surgery is not typically indicated for stage 4S neuroblastoma, as the primary tumor is often small and may not require resection.
* **Option C:** Radiation therapy is not a standard treatment for stage 4S neuroblastoma, as it can lead to significant long-term side effects, including growth restriction and secondary malignancies.
**Clinical Pearl / High-Yield Fact**
The prognosis for stage 4S neuroblastoma is generally excellent, with a high rate of spontaneous regression and long-term survival. However, close monitoring is essential to detect any signs of tumor progression or complications.
**Correct Answer:** C.