In patients with primary CNS lymphoma (PCNSL) treated with a methotrexate (MTX)-based chemotherapy, no gross cognitive decline has to be expected as a long-term treatment effect. MTX-induced white matter changes apparent on MRI are not inevitably associated with cognitive impairment. Nevertheless, a substantial fraction of patients with PCNSL retain cognitive deficits as a residual symptom of the tumor.

Almost 15% of patients in whom a stent is placed with a string sustain stent dislodgment and most of these patients will be women. We recommend considering the risks of dislodgment in each patient who undergoes ureteroscopy with stent placement and considering string removal if the surgeon believes that dislodgment could result in adverse events such as severe colic or obstruction.

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