title: Unusual clinical and MRI features of a cerebellopontine angle medulloepithelioma. Case report and review of literature.
abstract: We describe for the first time an unusual location and clinical presentation of medulloepithelioma, a rare embryonal tumor. A 5-year-old child presented with sudden onset of bilateral hearing loss. On imaging, the lesion appeared to be extra axial and was located in the right cerebello-pontine (CP) angle, extending into middle fossa along the trigeminal ganglion and in front of the brain stem into the opposite CP angle. It did not show any enhancement following contrast administration and had restricted diffusion on diffusion-weighted imaging, simulating an epidermoid. However, in vivo localized proton MR spectroscopy revealed a creatine peak dominated by a large choline resonance, peak of glycine with lactate/lipid and invisible N-acetylaspartate suggestive of a neoplastic lesion and not an epidermoid. Only subtotal resection could be performed and the patient had a stormy post-operative course due to extensive dissemination of the disease.
authors.affiliation: Department of Neurosurgery, Neurootology Unit, Sanjay Gandhi Post-Graduate Institute of Medical Sciences, Lucknow, India. drrajansyal@yahoo.co.in
authors.forename: Rajan
authors.initials: R
authors.lastname: Syal
authors.forename: Jaypal
authors.initials: J
authors.lastname: Reddy S
authors.forename: Raj
authors.initials: R
authors.lastname: Kumar
authors.forename: Isha
authors.initials: I
authors.lastname: Tyagi
authors.forename: A A Wani
authors.initials: AA
authors.lastname: Abrar
authors.forename: Narender
authors.initials: N
authors.lastname: Krishnani
authors.forename: Asht M
authors.initials: AM
authors.lastname: Mishra
authors.forename: Rakesh K
authors.initials: RK
authors.lastname: Gupta
mesh_terms: D001923:Brain Chemistry; D002528:Cerebellar Neoplasms / Q000175:diagnosis* / Q000601:surgery; D002530:Cerebellopontine Angle / Q000473:pathology* / Q000601:surgery; D002675:Child, Preschool; D002794:Choline / Q000032:analysis; D003401:Creatine / Q000032:analysis; D005998:Glycine / Q000032:analysis; D006312:Hearing Loss, Bilateral / Q000209:etiology; D006801:Humans; D019344:Lactic Acid / Q000032:analysis; D008279:Magnetic Resonance Imaging; D009682:Magnetic Resonance Spectroscopy; D018365:Neoplasm, Residual / Q000175:diagnosis; D018242:Neuroectodermal Tumors, Primitive / Q000175:diagnosis* / Q000601:surgery
chemical_list: D019344:Lactic Acid; D003401:Creatine; D002794:Choline; D005998:Glycine