title: Imaging diagnosis--Hemorrhagic meningioma.
abstract: An 8-year-old Labrador Retriever developed acute central vestibular signs. An extra-axial mass was detected on MR images ventral to the brainstem. The mass was both T1- and T2-hypointense; there was also thin-rimmed patchy contrast enhancement. These findings were nonspecific, but the extreme T2-hypointensity was notable and suggested a hemorrhagic mass. The histologic diagnosis was anaplastic meningioma with acute hemorrhage. These findings document an unusual appearance of a meningioma in MR images due to intratumoral hemorrhage.
authors.affiliation: Department of Veterinary Sciences, College of Veterinary Medicine, The Ohio State University, Columbus, OH, USA. martin-vaquero.1@osu.edu
authors.forename: Paula
authors.initials: P
authors.lastname: Martin-Vaquero
authors.forename: Ronaldo C
authors.initials: RC
authors.lastname: Da Costa
authors.forename: Famke
authors.initials: F
authors.lastname: Aeffner
authors.forename: Michael J
authors.initials: MJ
authors.lastname: Oglesbee
authors.forename: Rita L
authors.initials: RL
authors.lastname: Echandi
mesh_terms: D000818:Animals; D001344:Autopsy / Q000662:veterinary; D001933:Brain Stem / Q000473:pathology; D004283:Dog Diseases / Q000175:diagnosis* / Q000209:etiology / Q000473:pathology; D004285:Dogs; D037901:Euthanasia, Animal; D020300:Intracranial Hemorrhages / Q000150:complications / Q000473:pathology / Q000662:veterinary*; D008279:Magnetic Resonance Imaging / Q000379:methods / Q000662:veterinary; D008577:Meningeal Neoplasms / Q000150:complications / Q000175:diagnosis / Q000473:pathology / Q000662:veterinary*; D008579:Meningioma / Q000150:complications / Q000175:diagnosis / Q000473:pathology / Q000662:veterinary*