title: Choroid plexus papilloma and meningioma: coincidental posterior fossa tumors: case report and review of the literature.
abstract: OBJECTIVE
  We report an unusual case of an extraventricular choroid plexus papilloma (CPP) occupying the right ventral foramen magnum and lower right cerebellopontine angle (CPA), occurring together with a petro-tentorial meningioma. The clinical presentation, preoperative imaging, differential diagnosis, surgical treatment and histologic features of the two tumors are discussed.
  
  
  METHODS
  The patient presented with a 2-month history of headache, altered facial sensation, dysphagia, and gait unsteadiness. Neurologic examination confirmed a wide-based, unsteady gait, hoarse voice, anisocoria, and partial right vocal cord paralysis. Diagnostic imaging demonstrated right petro-tentorial and right ventral foramen magnum lesions, both hyperintense on contrasted images and suggestive of meningiomas. A right suboccipital craniotomy and far lateral approach was used to resect both tumors. The petro-tentorial tumor was a histologically confirmed meningioma, but the ventral foramen magnum tumor was an extraventricular CPP.
  
  
  CONCLUSIONS
  This is a rare occurrence of concomitant meningioma and CPP. There is no known link between these two tumors. An exophytic 4th ventricular CPP must be considered in the differential diagnosis of a CPA or foramen magnum tumor.
mesh_terms: D016545:Choroid Plexus Neoplasms / Q000175:diagnosis / Q000601:surgery; D005260:Female; D005539:Foramen Magnum; D005910:Glioma / Q000175:diagnosis / Q000601:surgery; D006801:Humans; D015192:Infratentorial Neoplasms / Q000175:diagnosis / Q000601:surgery; D008279:Magnetic Resonance Imaging / Q000379:methods; D008577:Meningeal Neoplasms / Q000175:diagnosis / Q000601:surgery; D008579:Meningioma / Q000175:diagnosis / Q000601:surgery; D008875:Middle Aged; D009378:Neoplasms, Multiple Primary / Q000175:diagnosis / Q000601:surgery