(en) Dear Sir, Parkinsonism secondary to an arachnoid cyst appears to be very rare. We report the case of a 75-year-old woman who developed progressive gait and cognitive slowing during the preceding year. More recently, she complained of postural instability. Neurological examination revealed mild postural and action tremors of the upper limbs, along with moderate bilateral akinesia that was predominant on the left side, as well as slight rigidity of the left arm. Her face was hypomimic. Her gait was slow with short steps and no arm swing. Postural reflexes were severely reduced (Hoehn and Yahr score 3). [...]
Mormont, E., Dorban, S., & Gustin, T. (2017). Parkinsonism and cognitive impairment due to a giant frontal arachnoid cyst and improving after shunting. Acta Neurologica Belgica, 117(1), 347-349. https://doi.org/10.1007/s13760-016-0632-3 (Original work published 2017)