PMC6416525_01
(a) Axial T1-weighted images demonstrated left optic nerve thickening. (b) Cerebrospinal fluid cytology showed elevated myeloid immature blasts. Wright-Giemsa stain, original magnificationx100.
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The symptom worsened and vision in both eyes gradually diminished until the patient was diagnosed with bilateral optic neuritis using contrast MRI (Fig. 1a). Because the patient's bilateral optic neuritis was refractory to the treatment, we examined the cerebrospinal fluid (CSF) and found an increased WBC count (1636 cells/mm3), indicative of myeloid immature blasts (Fig. 1b).