Severe hypercalcemia: A rare and unusual presentation of acute lymphoblastic leukemia.

Hypercalcemia is a rare and unusual complication of childhood malignancies. Acute lymphoblastic leukemia (ALL) presenting with hypercalcemia and lytic bone lesions is very rare in children. Here, we report a case of a 4-year-old girl with ALL who presented with severe hypercalcemia and radiological evidence of osteolytic lesions. Malignancies are the most common parathyroid hormone-independent cause of hypercalcemia. Severe hypercalcemia is a life-threatening emergency that should be addressed immediately. Effective treatment includes intense hydration, frusemide, calcitonin, and bisphosphonate in addition to the treatment of underlying cause.