Clinicoradiological changes of brain NK/T cell lymphoma

Clinicoradiological changes of brain NK/T cell lymphoma

6 Pages · 2011 · 4.88 MB · English

divided into the supratentorial region and brainstem. Compared with supratentorial tumors, the frequency of brainstem tumor-related parkinsonism is rare. Previous

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C A S E R E P O R TOpen Access Clinicoradiological changes of brain NK/T cell lymphoma manifesting pure akinesia: a case report Susumu Ishihara 1, Osamu Kano 2, Ken Ikeda 2*, Reiko Shimokawa 3, Kiyokazu Kawabe 2and Yasuo Iwasaki 2 Abstract Background:Pure akinesia (PA) is a distinct form of parkinsonism characterized by freezing phenomena. Little is known about brain tumor-associated PA. We highlight the clinicoradiological changes in a patient with PA and central nervous system (CNS) metastases of natural killer/T-cell lymphoma (NKTL). Case presentation: A 68-year-old man with stage IVB extranodal NKTL developed a gait disturbance. Neurological examination of his gait revealed freezing, start hesitation, short step, forward flexion posture, festination and postural instability. Mild facial hypomimia and micrographia were observed. There was no rigidity or tremor in any of the four extremities. Brain magnetic resonance imaging (MRI) displayed T2-hyperintense lesions in the dorsal brainstem, cerebellum and periventricular white matter. Diffusion-weighted imaging (DWI) and the apparent diffusion coefficient (ADC) revealed hyperintensity in these regions. Cerebrospinal fluid cytology revealed CD56- positive cells on immunohistochemical staining. The patient ’s neurological deficits did not respond to L-dopa treatment and intrathecal administration of methotrexate (MTX). Two weeks later, he displayed confusion and generalized convulsions. T2-hyperintense lesions spread to the basal ganglia and the infratentorial regions. Gadolinium enhancement was observed in the cerebellum and frontal subcortex. DWI and the ADC revealed diffusion-restricted lesions in the middle cerebellar peduncles, left internal capsules and cerebral white matter. MTX pulse therapy and intrathecal administration of cytosine arabinoside and MTX were performed. Two months later, his ambulatory state was normalized. Brain MRI also revealed marked alleviation of the infratentorial and supratentorial lesions. Conclusions: The clinicoradiological profile of our patient suggested that dorsal ponto-mesencephalic lesions could contribute to the pathogenesis of PA. Physicians should pay more attention to striking CNS seeding of metastatic NKTL. MTX pulse therapy had an excellent effect in improving serious symptoms and brain lesions in our patient. Background Pure akinesia (PA) is a distinct form of parkinsonism that was first

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