Acute Lymphoblastic Leukemia Presenting Solely as Low Back Pain.

A 23-year-old man with acute lymphoblastic leukemia presented to the emergency department without any history of constitutional symptoms (fatigue, anorexia, or weight loss), dyspnea, bruising, or bleeding. Presentation of acute leukemia solely as musculoskeletal pathology is common in pediatric populations but rare among adult patients. Recognizing this presentation of acute leukemia in adult patients could help prevent delayed diagnoses.