Pineoblastoma with ganglionic and glial differentiation: report of two cases

Two cases of pineoblastoma in infants are reported. Both cases exhibited ganglionic and astrocytic differentiation, and one case also showed retinoblastomatous features. Divergent differentiation has been frequently reported in pineocytomas, but ganglionic and glial features in the highly malignant primitive pineoblastoma are unusual. These cases extend the concept of pineoblastoma and further confirm the differentiating potential of primary pineal parenchymal neoplasms.