Cystic echinococcosis causing thrombosis of the inferior vena cava in a patient with multiple sclerosis treated with alemtuzumab.

Alemtuzumab, one of the very effective immunomodulatory forms of treatment for patients with highly active multiple sclerosis, can also have unexpected side effects. We present a case of cystic echinococcosis causing thrombosis of the inferior vena cava in a female patient after two cycles of alemtuzumab.