A 6-year-old male child presented with a cerebellar mass; after undergoing complete surgical resection of the mass, the histology of the mass reveals pilocytic astrocytoma. Of the following, the MOST appropriate next step in the management is

A 6-year-old male child presented with a cerebellar mass; after undergoing complete surgical resection of the mass, the histology of the mass reveals pilocytic astrocytoma. Of the following, the MOST appropriate next step in the management is

You are evaluating a 6-year-old male child with Langerhans cell histiocytosis (LCH); the parents state that the most common site of bone involvement is

Which type of leukemia has been MOST likely developed in a 2-year-old child with Down syndrome in the neonatal period?

A 10-mo-old boy has a left suprarenal mass. Surgery is accomplished with complete removal of the mass as well as the non-adherent lymph nodes; surgical biopsies are taken during surgery. The histology reveals poorly differentiated neuroblastoma with microscopic ipsilateral lymph nodes involvement. The contralateral lymph nodes are negative. Of the following, the BEST therapeutic approach for this infant is

Hemangiomas are the most common benign tumors of infancy, occurring more in full-term infants. Of the following, the most common risk factor of development of hemangioma is