[Pathological and immunohistochemical study of pineal parenchymal tumors].

OBJECTIVE

To investigate the histological typing and differentiation as well as clinical manifestation and prognosis in pineal parenchymal tumors (PPTs).

METHODS

The histological typing of 21 PPTs were made by using HE staining. Synaptophysin (Syn), neuron special enolase (NSE), neurofilament (NF), neuroblastoma (NB), glial fibrillary acid protein (GFAP), cytokeratin (CK), desmin (Des) were detected in 20 cases with SP immunohistochemical staining methods. Analysis of the clinical data and follow-up were performed.

RESULTS

9 pineocytomas, 4 pineoblastomas, 8 pineal parenchymal tumors of intermediate differentiation were found in 21 PPTs. Immunoreactivity to Syn, NSE, NF, GFAP, NB were in 20, 20, 14, 15, 2, while Des and CK were negative in all cases.

CONCLUSIONS

Pineal parenchymal tumors of intermediate differentiation were characterized by a distinctly biphasic pattern, including areas of pineocytoma and pineoblastoma, or with intermediate differentiation and transitional feature. PPTs expressed neuronic differentiation. Death rate of PPTs were higher inside 1 year after the operation.