Myeloid Sarcoma Presenting as Nasal and Orbital Mass: An Initial Manifestation of an Acute Myeloid Leukaemia.

Myeloid sarcoma is an extramedullary manifestation of Acute Myeloid Leukaemia and sometimes is the only indicator of the disease. The incidence varies between 3-9.1% of acute leukaemia cases. The blast infiltration is seen most commonly in skin, lymph node, gastrointestinal tract, bone, soft tissue though can involve any body site usually as a solitary lesion and is rarely seen in nasal cavity. We present two cases of myeloid sarcoma presenting as a nasal mass in a six year old girl and other as orbital mass in 32-year-old as an initial manifestation of acute myeloid leukaemia. Histopathological examination along with immunohistochemistry clinched the diagnosis of myeloid sarcoma. Examination of bone marrow aspirate revealed blasts which fulfilled the criteria for acute leukaemia. These cases are usually misdiagnosed because often lymphoma and granulocytic sarcoma is not considered in initial list of differential diagnoses. These rare cases are being presented here as early recognition and diagnosis will ensure rapid treatment of the condition and improve the survival.