“…1 Cases of leukaemic involvement of the central nervous system (CNS) are becoming more frequent because of the increased survival rate associated with more effective treatment including combination therapy of systemic chemotherapy, prophylactic irradiation, and intrathecal injection of cytotoxic drugs. [1][2][3][4][5] Direct invasion of the orbit with the neoplastic cells is common, but the involvement of the optic nerve, uveal tract, and retina is relatively rare. 2,3 The optic nerve is known to be one of the diseaserelapse sites in a patient with systemic or meningeal leukaemia, 2,4 but it was rarely reported as the initial isolated presentation for the relapse in a patient with complete remission.…”