A 2 year old patient presents to the pediatric emergency room with pallor, fatigue, petechiae, and unexplained fevers on and off for 4 weeks. The CBC shows an elevated white blood cell count. The blood smear shows a highly elevated number of Lymphoblasts. The nurse would suspect this type of pediatric cancer.

Rationale: A. Acute Lymphoblastic Leukemia (ALL): ALL is the most common pediatric cancer, typically affecting children between the ages of 2 and 5. Clinical signs include pallor, fatigue, petechiae, recurrent fevers, and bone marrow suppression. A CBC often shows elevated WBCs with a predominance of immature lymphoblasts on a peripheral smear. B. Hodgkin's Lymphoma: This cancer usually presents in older children and adolescents, often with painless cervical lymphadenopathy, night sweats, fever, and weight loss. It does not typically present with massive lymphoblast proliferation in peripheral blood, as seen in this case. C. Acute Myelogenous Leukemia (AML): AML is more common in adults but can occur in children. It presents with similar symptoms of bone marrow failure but is characterized by myeloblasts rather than lymphoblasts on the blood smear. D. Non-Hodgkin's Lymphoma: Pediatric non-Hodgkin's lymphoma often presents with rapidly enlarging lymph nodes, mediastinal mass, or abdominal symptoms. It is not primarily a bone marrow disease and would not typically show high lymphoblast counts in the peripheral blood.