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A 32-year-old man with a fourth ventricular mass

Fang-Yi Lee1, Yee-Jee Jan, Mei-Chin Wen

  • 1Department of Pathology, Taichung Veterans General Hospital, Taichung, Taiwan, R.O.C.

Brain Pathology (Zurich, Switzerland)
|March 18, 2009
PubMed

Insights

This study reports a rare lipoastrocytoma case in a 32-year-old man, characterized by signet-ring cells containing lipid droplets. Findings suggest a potentially better prognosis for this low-grade astrocytoma variant.

Area of Science:

  • Neuro-oncology
  • Pathology
  • Neurosurgery

Background:

  • Lipoastrocytomas are exceptionally rare glial tumors, with only four prior cases documented in medical literature.
  • This report details a novel case occurring within the fourth ventricle, a location not previously associated with this tumor type.

Observation:

  • The tumor exhibited characteristic signet-ring cells, frequent eosinophilic granular bodies, and focal perivascular arrangements.
  • Immunohistochemistry revealed strong GFAP and S-100 protein expression in vacuolated tumor cells.
  • Ultrastructural analysis confirmed the presence of lipid droplets and intermediate filaments within the signet-ring cells, differentiating them from ependymoma features.

Findings:

  • The study confirms that the observed vacuoles represent lipid droplets within astrocytic tumor cells, establishing the diagnosis of lipoastrocytoma.
  • A low proliferation index (<10%) was noted, further supporting a low-grade classification.
  • Absence of ultrastructural features typical of ependymomas aids in differential diagnosis.

Implications:

  • This case expands the known clinical spectrum and anatomical locations of lipoastrocytomas.
  • The confirmed lipid droplet content in astrocytic cells provides crucial diagnostic information.
  • Observed features suggest a favorable prognosis, potentially guiding future treatment strategies for this rare low-grade astrocytoma variant.

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