Which of the following is the most common intraabdominal tumor in children?

Neuroblastoma is the most common intraabdominal tumor in children, accounting for approximately 30% of all pediatric tumors. This tumor primarily arises from neuroblasts, which are precursor cells of the sympathetic nervous system, and is most commonly found in the adrenal glands, but it can also originate in other areas of the abdomen, including the retroperitoneum.

The age of presentation often varies, with most cases diagnosed in children younger than 5 years old. The clinical features may include abdominal pain, a palpable mass, and signs of metastasis, such as bone pain or adenopathy. The natural history of neuroblastoma can also include spontaneous regression in some infants, making it unique among pediatric tumors.

Understanding this position of neuroblastoma in pediatric oncology allows for better screening and early detection strategies, which is crucial since the prognosis varies significantly based on age and extent of disease at diagnosis.