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Primitive neuroectodermal tumor (PNET). A case report

G M Szpak1, W Papierz, P P Liberski

  • 1Department of Neuropathology, Institute of Psychiatry and Neurology, Warszawa.

Folia Neuropathologica
|January 1, 1995
PubMed
Summary
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A rare central nervous system tumor, primitive neuroectodermal tumor (PNET), infiltrated the leptomeninges in a young female. This rare PNET case highlights aggressive tumor spread and rapid progression in the central nervous system.

Area of Science:

  • Neuro-oncology
  • Neuropathology

Background:

  • Primitive neuroectodermal tumors (PNETs) are rare, aggressive central nervous system (CNS) neoplasms.
  • This case report details a PNET in a 19-year-old female, emphasizing its rarity and challenging diagnosis.

Observation:

  • The patient presented with meningismus, increased intracranial pressure, and hydrocephalus, indicative of CNS compromise.
  • Autopsy revealed extensive neoplastic infiltration throughout the subarachnoid space and ventricular system, including subependymal nodules.

Findings:

  • Microscopic examination showed small cells forming neuroblastic Homer Wright rosettes.
  • Immunohistochemical markers (synaptophysin, chromogranin A, GFAP, vimentin) supported the PNET diagnosis.
  • The tumor primarily affected the leptomeninges, leading to subarachnoid space obliteration.

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Implications:

  • This case underscores the aggressive nature and leptomeningeal spread of PNETs.
  • Understanding PNET behavior is crucial for diagnosis and management of rare CNS tumors.
  • Further research into PNET pathogenesis and targeted therapies is warranted.