title: Demyelination preceding a diagnosis of central nervous system lymphoma.
abstract: We present a case of primary central nervous system lymphoma (PCNSL) co-existing with demyelination in a young immunocompetent woman. The patient presented with an expansile, enhancing lesion in the right occipital lobe which was initially attributed to tumefactive demyelination and subsequently proven to be PCNSL. PCNSL is an uncommon malignancy, particularly in young immunocompetent patients, and on MRI classically manifests as a homogeneously enhancing solitary mass with a predilection for periventricular and superficial locations, often contacting ventricular and meningeal surfaces. Tumefactive demyelinating lesions typically present as large white matter lesions with little mass effect or vasogenic oedema and "open-ring" enhancement, with the incomplete portion of the ring on the grey matter side of the lesion. PCNSL and tumefactive demyelinating lesions share some radiological features and thus, as our case report highlights, differentiating between them can be challenging. We discuss how the application of conventional and advanced MRI techniques combined with clinical and laboratory findings can lead to a precise diagnosis, potentially obviating the need for biopsy and facilitating prompt and appropriate treatment.
authors.affiliation: Department of Radiology, 1st Floor, 1B Building, The Royal Melbourne Hospital, Grattan Street, Parkville, VIC 3050, Australia. Electronic address: sarahkalus@gmail.com.
authors.forename: Sarah
authors.initials: S
authors.lastname: Kalus
authors.affiliation: Department of Radiology, 1st Floor, 1B Building, The Royal Melbourne Hospital, Grattan Street, Parkville, VIC 3050, Australia.
authors.forename: Bruno
authors.initials: B
authors.lastname: Di Muzio
authors.affiliation: Department of Radiology, 1st Floor, 1B Building, The Royal Melbourne Hospital, Grattan Street, Parkville, VIC 3050, Australia; Department of Radiology, The University of Melbourne, Parkville, Australia.
authors.forename: Frank
authors.initials: F
authors.lastname: Gaillard
mesh_terms: D000328:Adult; D001932:Brain Neoplasms / Q000150:complications / Q000473:pathology*; D003711:Demyelinating Diseases / Q000209:etiology*; D005260:Female; D006801:Humans; D008223:Lymphoma / Q000150:complications / Q000473:pathology*; D008279:Magnetic Resonance Imaging / Q000379:methods
keywords: Multiple sclerosis; Neuroradiology; Primary central nervous system lymphoma; Tumefactive demyelination