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Extradural ependymal tumor with myxopapillary and ependymoblastic differentiation in a case of Schinzel-Giedion syndrome.

Abstract
Primary extradural ependymomas are rare neoplasms usually of the myxopapillary type. Reports on malignant primary extradural ependymal tumors are exceptionally rare. We here report on a 3-year-old boy with Schinzel-Giedion syndrome (SGS), who presented with lumbar spina bifida occulta and a progressive extraspinal lesion in the subcutaneous sacrococcygeal region. Microscopic examinations revealed an uncommon ependymal tumor with well-differentiated regions reflecting myxopapillary ependymoma and highly anaplastic regions with numerous mitoses, necroses, ependymal rosettes and ependymoblastic rosettes. Final neuropathologic diagnosis was an extraspinal anaplastic ependymal tumor with myxopapillary and ependymoblastic differentiation, corresponding to WHO grade IV. SGS is a very rare disorder with a likely autosomal recessive pattern of inheritance. So far, 42 cases have been reported, among them 7 were diagnosed to have malignant neoplasms, including three malignant sacrococcygeal teratomas, two sacrococcygeal primitive neuroectodermal tumors (PNET), one hepatoblastoma and one malignant kidney tumor. The present case is the first report on an ependymal tumor with a mixture of myxopapillary, anaplastic and ependymoblastic features and the first report on an ependymal tumor arising on the genetic background of SGS.
AuthorsRudi Beschorner, Manfred Wehrmann, Ulrike Ernemann, Michael Bonin, Veronka Horber, Barbara Oehl-Jaschkowitz, Richard Meyermann, Andreas Dufke
JournalActa neuropathologica (Acta Neuropathol) Vol. 113 Issue 3 Pg. 339-46 (Mar 2007) ISSN: 0001-6322 [Print] Germany
PMID17165030 (Publication Type: Case Reports, Journal Article)
Topics
  • Central Nervous System Neoplasms (complications, genetics, pathology)
  • Child, Preschool
  • Chromosome Mapping
  • Ependymoma (complications, genetics, pathology)
  • Genetic Diseases, Inborn (complications, genetics, pathology)
  • Humans
  • Magnetic Resonance Imaging
  • Male
  • Review Literature as Topic
  • Sacrococcygeal Region (pathology)

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