title: [Paraganglioma of the cauda equina with papillary pattern and cytokeratin expression: 2 potential sources of diagnostic error. Report of a case and review of the literature].
abstract: Paragangliomas are unusual neuroendocrine tumours, rare in the cauda equina and filum terminale. Due to their low frequency, no classical patterns and dual immunophenotype, may be misinterpreted as others neoplasms more frequent in this site. It is our aim to report a case of paraganglioma of the cauda equina and filum terminale (PGCCFT), standing out it's histological-immunohistochemical pattern, differential diagnosis, prognostic and treatment. We reviewed the clinical presentation, NMR features and morphological aspect of one PGCCFT, diagnosed in the ABC Medical Center's Surgical Pathology Department of Mexico City. Report of the case: 26 years old man, who had been suffering a low lumbar pain for one year before he came to our hospital. The NRM showed heterointense lesion in the level of first and second vertebra, suggesting ependymoma. The tumor was totally resected. Histologically it was papillary, the chief cells have stained with chromogranin, synaptophysin, and cytokeratin. The few sustentaculars cells were S100 positive. The patient have haven a favorable course.
  
  
  CONCLUSIONS
  The certainty and differential diagnosis of paragangliomas of the cauda equina and filum terminale needs correlation between histological pattern and immunophenotype, the last must be considered in the peculiar context of this anatomic region.
authors.affiliation: Servicio de Patología Quirúrgica, Hospital ABC México D.F. México.
authors.forename: T
authors.initials: T
authors.lastname: Cuesta-Mejías
authors.forename: F
authors.initials: F
authors.lastname: Revilla-Pacheco
authors.forename: C
authors.initials: C
authors.lastname: del Bosque-Patoni
authors.forename: C
authors.initials: C
authors.lastname: Ortiz-Hidalgo
mesh_terms: D000328:Adult; D002420:Cauda Equina; D003951:Diagnostic Errors; D006801:Humans; D007633:Keratins / Q000096:biosynthesis*; D008297:Male; D010235:Paraganglioma / Q000378:metabolism* / Q000473:pathology*; D010524:Peripheral Nervous System Neoplasms / Q000378:metabolism* / Q000473:pathology*
chemical_list: D007633:Keratins