Orbito-ocular granulocytic sarcoma (OOGS) and acute myeloblastic leukemia (AML) with duplication of Philadelphia chromosome.

A 6-year-old Turkish boy with bilateral orbito-ocular granulocytic sarcoma and AML is described. Cytogenetic studies on peripheral blood disclosed an abnormal hyperdiploid population with a double Ph chromosome. Despite intensive chemotherapy, he achieved only partial remission. Repeated cytogenetic studies on bone marrow during relapse revealed the persistence of double Ph chromosome. The aggressive course and the short survival time of this patient, despite adequate chemo-radiotherapy, may be explained by the presence of the double Ph chromosome.