Myeloid sarcoma: Case report with an unusual presentation in radicular cyst capsule

Myeloid sarcoma is a tumour mass of myeloblasts or immature myeloid cells occurring in an extra-medullary site or in a bone. The tumour may precede or occur concurrently with acute or chronic myeloid leukaemia or with other types of myeloproliferative disorders or myelodysplastic syndromes. Granulocytic sarcoma is a rare presentation in the oral and maxillofacial region, but has been reported in oral soft tissues as well as in intra-osseous sites. The majority of these cases occur in patients with known leukaemia or those who eventually develop the disease. Our report details the presentation of myeloid sarcoma in radicular cyst capsule, being also one of the unusual intra-osseous presentations of this rare tumour.