[Pediatric acute lymphoblastic leukemia initially presenting with bone marrow necrosis]

Area of Science:

• Pediatric Hematology Oncology
• Hematopathology

Background:

• Acute lymphoblastic leukemia (ALL) is a common childhood cancer.
• Bone marrow necrosis (BMN) is a rare complication that can affect leukemia diagnosis.

Observation:

• A 4-year-old boy presented with symptoms suggestive of leukemia, including fever and leg pain.
• Initial bone marrow examination revealed extensive necrosis, obscuring the presence of leukemic cells.
• A subsequent bone marrow examination confirmed acute lymphoblastic leukemia after the necrosis resolved.

Findings:

• The initial presentation of massive bone marrow necrosis mimicked other conditions, delaying definitive diagnosis.
• Leukemic cells were identified in a repeat bone marrow biopsy approximately one month later.
• The patient achieved complete remission following standard chemotherapy.

Implications:

• Massive bone marrow necrosis in pediatric patients warrants repeated bone marrow examinations for accurate diagnosis of underlying hematologic malignancies.
• Early and correct diagnosis is critical for initiating timely and effective treatment for pediatric acute lymphoblastic leukemia.
• This case highlights the importance of considering BMN as a potential diagnostic challenge in pediatric leukemia.