Orbital mass secondary to precursor T-cell acute lymphoblastic leukemia - A rare presentation

We describe a 40-year-old woman with a history of precursor T-cell acute ly mphoblastic leukemia who developed an orbital mass associated with diffuse infiltration of the paranasal sinuses. The clinical and radiologic findings suggested an orbital abscess. Examination of orbital and ethmoid sinus bio psy specimens revealed relapse of precursor T-cell acute lymphoblastic leuk emia. Although orbital involvement by granulocytic sarcoma (also known as e xtramedullary myeloid cell tumor and chloroma) with or without concurrent a cute myeloid leukemia is well described in the literature, similar presence of acute lymphoblastic leukemia of either precursor T-cell or B-cell linea ge is rare.