Masquerade of Leukemic Infiltration With Cerebral Sinus Venous Thrombosis Causing Papilledema by Asparaginase Therapy.

Acute lymphoblastic leukemia (ALL) is a hematological cancer that can cause ocular tissue involvement. Asparaginase is a chemotherapy regimen that is commonly used in leukemia which could lead to similar ocular manifestations. We report a patient with a history of ALL for seven months on asparaginase therapy and persistent cerebral sinus venous thrombosis (CSVT) with acute venous infarction in the left frontal lobe presented with worsening vision. On examination, he had a visual acuity (VA) of (6/21) in the right eye and (6/60) in the left eye, with a mild left eye abduction limitation. Fundal examination showed bilateral prominent multilayered retinal hemorrhages and papilledema with absence of leukemic infiltration. His chemotherapy regimen was held and a one month follow up was scheduled. Follow up after one month of chemotherapy cessation showed resolution of both VA and fundal exam findings. It is crucial to differentiate between asparaginase toxicity and infiltration of the disease in ALL patients. As this would determine whether the treatment should be continued or suspended.