5-Fluorouracil associated neurovascular toxicities.

Fluorouracil (5-FU) is a commonly used chemotherapeutic agent in many cancers. The widely reported adverse effects are infusion reactions, rash, fever, nausea, vomiting, peripheral neuropathy, and hepatic injury. However, there are limited data about its neurological side effects. Herein, we are reporting 3 cases of 5-FU induced neurovascular toxicities. Cerebral vasospasm with associated transient ischemia is a rare but significant adverse effect of the 5-FU. Stroke-like presentation makes timely recognition extraordinarily important. Differentiating stroke mimics is crucial as recombinant tissue plasminogen activator therapy should be given within a 4.5 hours window after an ischemic stroke. We suggest that 5-FU induced cerebral vasospasm can present with acute stroke-like symptoms. Physicians should be aware of stroke mimics as a differential diagnosis to spare their patients from unnecessary invasive and high-risk treatments.