Common childhood tumors are – a) Acute lymphoblastic leukemiab) Chronic lymphoblastic leukemiac) Chronic myeloid leukemiad) Brain tumore) Wilm’s tumor
**Core Concept**
Childhood tumors are a significant concern in pediatric oncology, with various types affecting children worldwide. The most common types are often linked to genetic predispositions, environmental factors, and developmental anomalies.
**Why the Correct Answer is Right**
Acute lymphoblastic leukemia (ALL) is the most common childhood cancer, accounting for approximately 30% of all childhood cancer cases. It arises from the clonal expansion of lymphoid progenitor cells in the bone marrow, often due to genetic mutations in the lymphoid development pathway. The disease is characterized by the overproduction of immature white blood cells, leading to bone marrow failure and systemic symptoms.
**Why Each Wrong Option is Incorrect**
* **Option B:** Chronic lymphocytic leukemia (CLL) is a rare condition in children and typically affects adults over the age of 60.
* **Option C:** Chronic myeloid leukemia (CML) is also rare in children and usually occurs in adults, often associated with the BCR-ABL1 genetic fusion.
* **Option D:** Brain tumors are a common type of childhood cancer but account for a smaller proportion of cases compared to ALL.
* **Option E:** Wilms tumor (nephroblastoma) is a type of kidney cancer in children but is less common than ALL.
**Clinical Pearl / High-Yield Fact**
ALL diagnosis often involves a combination of clinical presentation, laboratory tests, and imaging studies. Early recognition and treatment are crucial, as ALL is highly curable with appropriate therapy.
**Correct Answer:** A. Acute lymphoblastic leukemia