Data sources: Case report, diagnostic evidence, and scientific literature. Conclusions: Arterial thrombosis is an extremely rare complication of multichemotherapy treatment of breast cancer. Although the risk of arterial thromboembolism appears to be low, it can have devastating complications that result in significant morbidities and, sometimes, death. Implications for practice: As the risk of arterial thrombosis is low, many healthcare providers may not be aware of this potentially serious complication. Thrombosis prophylaxis should be considered for patients with risk factors. In cases where arterial thrombosis occurs, immediate thrombolitic therapy or operative intervention should be considered.