Misdiagnosis of myeloid sarcoma is common and can be attributed to several factors, including its morphological resemblance to lymphomas and other small round blue cell tumors [4,12], the unavailability of clinical history and hematological findings at the time of biopsy interpretation, and the aberrant expression of lymphoid markers such as CD3 and CD79a in some myeloid sarcoma cases [7,8]. The gene discussed is CD79A; the disease is myeloid sarcoma.