title: Atypical case of perimesencephalic subarachnoid hemorrhage.
abstract: Perimesencephalic subarachnoid hemorrhage (PM-SAH) refers to intracranial hemorrhage located in the perimesencephalic cistern. The etiology remains mainly unclear, although venous leakage or rupture has been postulated. We report an interesting case of a 57-year-old healthy man who presented initially with PM-SAH with worsening of subcortical lesions on follow-up neuroimaging. Histopathological examination demonstrated cerebral amyloid angiopathy with perivascular inflammation.
authors.affiliation: Department of Neurology, University of California, Los Angeles, USA.|Department of Neurology, Charleston Area Medical Center, Charleston, West Virginia, USA.
authors.forename: Konark
authors.identifier: http://orcid.org/0000-0002-5383-8101
authors.initials: K
authors.lastname: Malhotra
authors.affiliation: Department of Pathology, University of California, Los Angeles, USA.
authors.forename: Shino D
authors.initials: SD
authors.lastname: Magaki
authors.affiliation: Department of Pathology, University of California, Los Angeles, USA.
authors.forename: Maria Inmaculada
authors.initials: MI
authors.lastname: Cobos Sillero
authors.affiliation: Department of Pathology, University of California, Los Angeles, USA.
authors.forename: Harry V
authors.initials: HV
authors.lastname: Vinters
authors.affiliation: Department of Radiology, University of California, Los Angeles, USA.
authors.forename: Reza
authors.initials: R
authors.lastname: Jahan
authors.affiliation: Department of Neurology, Mayo Clinic, Rochester, Minnesota, USA.
authors.forename: Robert D
authors.initials: RD
authors.lastname: Brown
authors.affiliation: Department of Neurology, University of California, Los Angeles, USA.
authors.forename: David S
authors.initials: DS
authors.lastname: Liebeskind
mesh_terms: D001921:Brain / Q000000981:diagnostic imaging / Q000473:pathology; D016657:Cerebral Amyloid Angiopathy / Q000150:complications / Q000000981:diagnostic imaging / Q000473:pathology*; D003937:Diagnosis, Differential; D038524:Diffusion Magnetic Resonance Imaging; D004660:Encephalitis / Q000150:complications / Q000175:diagnosis; D006801:Humans; D008297:Male; D008636:Mesencephalon / Q000098:blood supply / Q000473:pathology; D008875:Middle Aged; D013345:Subarachnoid Hemorrhage / Q000150:complications / Q000000981:diagnostic imaging / Q000473:pathology*
keywords: cerebral amyloid angiopathy; perimesencephalic; subarachnoid hemorrhage