title: Multiple calcifying pseudoneoplasms of the neuraxis (MCAPNON): Distinct entity, CAPNON variant, or old neurocysticercosis?
abstract: We report a case of multiple calcifying pseudoneoplasms of the neuraxis (MCAPNON) with associated multifocal perivascular microcalcifications and vascular calcinosis. Calcifying pseudoneoplasm of the neuraxis (CAPNON) is a very rare condition that may arise in extra-axial and occasionally, in intra-axial locations. Moreover, it is nearly always a solitary mass with only one case with two lesions reported. While the etiology and pathogenesis of CAPNON remains unclear, the histopathology findings of this entity have been well described. We report a case of a 62-year-old woman with 18 calcifying radiologic lesions involving bilateral cerebral hemispheres. Histologically, these lesions have features similar to that reported for CAPNON, including nodular calcification with fibro-osseous components and peripheral histiocytic reaction. The patient had a poorly documented diagnosis of neurocyticercosis 32 years prior, although without tissue confirmation. The lack of detectable cysticercus serum antibody titers, and absence of residual larval or cyst wall tissue render multifocal calcific involution of that parasite unprovable although still plausible. We also raise the possibility of a blood-brain barrier derangement and/or a metabolic disorder as an alternative etiology. Whether this case of MCAPNON shares the same pathogenesis as the usual solitary CAPNON is unclear.
authors.affiliation: Department of Pathology, Jordan University Hospital, University of Jordan, Amman, Jordan.|Department of Pathology and Laboratory Medicine (Neuropathology), University of California at Los Angeles, Los Angeles, CA, USA.
authors.forename: Maram
authors.initials: M
authors.lastname: Abdaljaleel
authors.affiliation: Department of Neurology, University of California at Los Angeles, Los Angeles, CA, USA.
authors.forename: Rajarshi
authors.initials: R
authors.lastname: Mazumder
authors.affiliation: Department of Neurology, University of California at Los Angeles, Los Angeles, CA, USA.
authors.forename: Chirag B
authors.initials: CB
authors.lastname: Patel
authors.affiliation: Department of Pathology and Laboratory Medicine (Neuropathology), University of California at Los Angeles, Los Angeles, CA, USA.
authors.forename: Kyuseok
authors.initials: K
authors.lastname: Im
authors.affiliation: Department of Radiological Sciences (Neuroradiology), University of California at Los Angeles, Los Angeles, CA, USA.
authors.forename: Whitney
authors.initials: W
authors.lastname: Pope
authors.affiliation: Department of Neurosurgery, David Geffen School of Medicine, University of California at Los Angeles, Los Angeles, CA, USA.
authors.forename: Linda M
authors.initials: LM
authors.lastname: Liau
authors.affiliation: Department of Pathology and Laboratory Medicine (Neuropathology), University of California at Los Angeles, Los Angeles, CA, USA.|Department of Neurology, University of California at Los Angeles, Los Angeles, CA, USA.
authors.forename: Harry V
authors.initials: HV
authors.lastname: Vinters
authors.affiliation: Department of Pathology and Laboratory Medicine (Neuropathology), University of California at Los Angeles, Los Angeles, CA, USA.
authors.forename: William H
authors.initials: WH
authors.lastname: Yong
mesh_terms: D001921:Brain / Q000000981:diagnostic imaging / Q000473:pathology*; D001927:Brain Diseases / Q000000981:diagnostic imaging / Q000473:pathology*; D002114:Calcinosis / Q000000981:diagnostic imaging / Q000473:pathology*; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D008875:Middle Aged; D020019:Neurocysticercosis / Q000000981:diagnostic imaging / Q000473:pathology*
keywords: CAPNON; CNS; brain; calcifying pseudoneoplasm; fibro-osseous lesion; neuraxis; vascular mineralization