[An unusual cause of hip pain: pelvic granulocytic sarcoma]

A 27-year-old male patient presented with right-sided hip pain. Magnetic resonance imaging of the hip joint revealed an extensive intrapelvic mass adjacent to the iliopsoas muscle. Laboratory tests showed severe leukocytosis and a differential WBC count enabled the diagnosis of chronic myeloid leukemia (CML). The pelvic mass was then assessed as granulocytic sarcoma developing from CML. It should be kept in mind that the initial presenting feature of hematological diseases such as CML may be hip pain arising from CML-associated granulocytic sarcoma.