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Related Concept Videos

The Retinoblastoma Gene01:20

The Retinoblastoma Gene

Tumor suppressor genes are normal genes that can slow down cell division, repair DNA mistakes, or program the cells for apoptosis in case of irreparable damage. Hence, they play an essential role in preventing the proliferation of damaged cells.
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Related Experiment Video

Updated: Jun 22, 2026

Optic Nerve Transection: A Model of Adult Neuron Apoptosis in the Central Nervous System
12:06

Optic Nerve Transection: A Model of Adult Neuron Apoptosis in the Central Nervous System

Published on: May 12, 2011

Primary, non-exophytic, optic nerve germ cell tumors.

Michael L DiLuna1, Aimee M Two1, Gillian H Levy2

  • 1Department of Neurosurgery, Yale University School of Medicine, TMP4, 333 Cedar Street, New Haven, CT, 06510, USA.

Journal of Neuro-Oncology
|June 26, 2009
PubMed
Summary

Primary optic chiasm germ cell tumors (GCTs) are rare and mimic optic chiasmatic gliomas (OCGs) on imaging. Biopsy confirmation is crucial for accurate diagnosis and treatment of these vision-threatening tumors.

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Area of Science:

  • Neuro-oncology
  • Ophthalmology
  • Endocrinology

Background:

  • Optic chiasm tumors are uncommon, often linked to phakomatoses.
  • Primary, isolated optic chiasm germ cell tumors (GCTs) are exceptionally rare.
  • GCTs can present with imaging features indistinguishable from optic chiasmatic gliomas (OCGs).

Observation:

  • Two young men presented with progressive, painless vision loss and pituitary dysfunction (diabetes insipidus).
  • Brain imaging was inconclusive, suggesting OCG.
  • Surgical exploration revealed diffusely enlarged and discolored optic chiasms without other sellar/suprasellar pathology.

Findings:

  • Pathology confirmed GCTs in both cases: a malignant mixed GCT and a germinoma.
  • This series includes the first reported case of a primary, non-exophytic malignant mixed GCT.
  • Tissue biopsy is essential for definitive diagnosis.

Implications:

  • Accurate tissue diagnosis is critical as treatment for optic chiasm GCTs differs significantly from OCGs.
  • Highlights the importance of considering GCTs in the differential diagnosis of optic chiasm masses.
  • Emphasizes the need for biopsy in cases of progressive optic chiasm tumors with ambiguous imaging.