Unilateral infiltration of the optic nerve revealing relapse of an acute lymphoblastic leukemia.

Introduction: Ocular infiltration of leukemia can involve orbit, uveal tract, retina and optic nerve. It may result from direct ocular infiltration by leukemic cells or indirect ocular involvement resulting from secondary hematologic changes, opportunistic infections and complications of various modalities of therapy. We report a case of unilateral infiltration of the optic nerve revealing a relapse of acute lymphoblastic leukemia.

Case Report: forty eight years-old woman in a remission of acute B lymphoblastic leukemia presented with headaches and blurred vision in the left eye. Ophthalmic examination showed a visual acuity reduced to 20/200 in the left eye, and a voluminous disc edema with papillary mass surrounded by retinal hemorrhages, exudates and important serous retinal detachment. CT scan showed a thickened left optic nerve and excluded true papillary edema due to intracranial hypertension secondary to central nervous system involvement. Myelogram and lumbar punction demonstrated blast infiltration and confirmed ocular relapse of the leukemia.

Conclusion: The incidence of ocular involvement lymphoblastic acute leukemias decreased since the introduction of a systematic prophylactic treatment of central nervous system. Periodic ophthalmic examination is necessary to allow early diagnosis and treatment.