Risk stratification and appropriate treatment selection for children with precursor B-acute lymphoblastic leukemia (B-ALL) have improved outcomes. We report the case of a 4-year-old male with a lymphomatous cavernous sinus mass, a previously undescribed presentation of newly diagnosed hyperdiploid B-ALL. Few case reports in the literature describe lymphomatous involvement in this region, but none are associated with pediatric B-ALL. This case presented unique treatment and risk assignment challenges given the intracranial location of this tumor and proximity to the central nervous system.
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