Ptosis is a rare side effect of vincristine chemotherapy in patients treated for cancer. We report a case of a child with common B-cell acute lymphoblastic leukemia who developed bilateral moderate ptosis following the chemotherapy protocol of the United Kingdom Acute Lymphoblastic Leukemia (ALL) regimen A. The patient showed dramatic clinical improvement after a combination of oral pyridoxine and thiamine treatment. We provide a literature review of this uncommon presentation.
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