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Primary pulmonary primitive neuroectodermal tumor (PNET). A case report.

Y Mikami1, M Nakajima, H Hashimoto

  • 1Department of Pathology, Kawasaki Medical School Hospital, Kurashiki, Okayama,. mika@med.kawasaki-m.ac.jp

Pathology, Research and Practice
|March 23, 2001
PubMed
Summary
This summary is machine-generated.

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This study details a rare primary pulmonary primitive neuroectodermal tumor (PNET) in a teenage girl. Despite treatment, the aggressive PNET recurred, highlighting the need for prompt chemotherapy.

Area of Science:

  • Oncology
  • Pathology
  • Genetics

Background:

  • Primary pulmonary primitive neuroectodermal tumors (PNETs) are exceptionally rare.
  • PNETs are aggressive small round blue cell tumors with neuroectodermal differentiation.

Observation:

  • A 17-year-old female presented with a primary lung PNET.
  • Gross examination revealed a well-circumscribed, whitish-yellow mass with necrosis.
  • Microscopic analysis showed sheets of small cells with high nuclear-to-cytoplasmic ratio.

Findings:

  • Immunohistochemistry was positive for MIC2 gene product, negative for neuroendocrine markers.
  • Cytogenetic analysis revealed a hypertriploid karyotype.
  • RT-PCR confirmed EWS/FLI-1 fusion transcripts, diagnostic of PNET.

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Implications:

  • Primary pulmonary PNET in young patients is highly aggressive.
  • Early combined systemic chemotherapy is crucial, even for organ-confined disease.
  • This case underscores the importance of molecular diagnostics in PNET.