A 14-year-old boy presents with bleeding gums, oral ulcers, anemia, and an enlarged liver but no swollen lymph nodes. His total white blood cell count is 100,000 cells/mm³. What is the most likely diagnosis?

Explanation

The patient's symptoms of gingival bleeding, oral ulcers, anemia, hepatomegaly, absence of lymphadenopathy, and a very high white blood cell count are characteristic of acute myeloid leukemia (AML). AML commonly presents with these findings, distinguishing it from chronic leukemias.