title: Extraventricular choroid plexus papilloma in the brainstem.
abstract: Choroid plexus papilloma (CPP) is extremely rare in the brainstem. The authors report the case of a 10-year-old boy with a lesion in the pons that was misdiagnosed as a glioma preoperatively. The boy underwent partial resection of the lesion, which was diagnosed as a CPP based on histopathological findings. The authors review the MRI findings in this case and conclude that the presence of a well-defined boundary and no obvious cerebral edema are valuable features for distinguishing brainstem CPP from glioma. Although previous reports of parenchymal CPPs have described enhancement on contrast-enhanced T1-weighted MR images, the lesion in this case did not demonstrate significant enhancement. The authors note that the diagnosis of extraventricular CPP cannot be ruled out in a case of brainstem tumor without marked enhancement.
authors.affiliation: Department of Neurosurgery, West China Hospital, Sichuan University, Chengdu, Sichuan Province, People’s Republic of China.
authors.forename: Anqi
authors.initials: A
authors.lastname: Xiao
authors.forename: Jianguo
authors.initials: J
authors.lastname: Xu
authors.forename: Xin
authors.initials: X
authors.lastname: He
authors.forename: Chao
authors.initials: C
authors.lastname: You
mesh_terms: D001933:Brain Stem / Q000473:pathology*; D020295:Brain Stem Neoplasms / Q000150:complications / Q000175:diagnosis* / Q000473:pathology / Q000601:surgery*; D002648:Child; D003287:Contrast Media; D003937:Diagnosis, Differential; D005910:Glioma / Q000175:diagnosis / Q000601:surgery; D006261:Headache / Q000209:etiology; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods; D008297:Male; D009325:Nausea / Q000209:etiology; D020288:Papilloma, Choroid Plexus / Q000150:complications / Q000175:diagnosis* / Q000473:pathology / Q000601:surgery*; D011856:Radiographic Image Enhancement; D014057:Tomography, X-Ray Computed
chemical_list: D003287:Contrast Media