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Figure 9a. Unilateral retinoblastoma in 20-month-old girl. (a) Transverse gadolinium-enhanced T1-weighted MR image (575/15) of right eye shows large tumor mass associated with prelaminar optic nerve invasion (arrow), which was not suspected. Notice absence of bulk of tumor mass near the optic disc. (b) Histopathologic specimen depicts optic disc (O) invaded by retinoblastoma (R). (Hematoxylin-eosin stain; original magnification, x10 objective.)
