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Figure 10a. Bilateral retinoblastoma in 15-month-old girl. (a) Transverse T1-weighted MR image (375/14) of left eye obtained after gadolinium-based contrast agent administration shows retinoblastoma at posterior part of the eyeball with normal thickness of underlying optic nerve disc and linear enhancement pattern of choroidoretinal complex (arrow) and choroid. Both prelaminar and postlaminar tumor invasion of the optic nerve were not suspected. (b) Histopathologic specimen of optic nerve (O) revealed postlaminar tumor (R) invasion (arrow). (Hematoxylin-eosin stain; original magnification, x10 objective.)