Abstract
Retinoblastoma is the most common primary, intraocular neoplasm of childhood.
Histologically, retinoblastoma resembles, in many respects, other pediatric malignancies
such as medulloblastoma and neuroblastoma. These tumors are composed
of small, basophilic cells with scanty cytoplasm and often form non-specific Homer
Wright rosettes. Retinoblastomas frequently possess, in addition, the distinctive
Flexner-Wintersteiner rosettes, a form of photoreceptor
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