Endovascular Repair of Internal Mammary Artery Aneurysms in 2 Sisters with SMAD3 Mutation

True aneurysms of the internal mammary artery are rare and have been described in association with vasculitis or connective tissue disorders. Herein, we describe 2 cases of familial internal mammary artery aneurysms (IMAs) in 2 sisters with SMAD3 mutation. The older sister presented at the age of 54 years with an incidental diagnosis of a multilobed right IMA and the younger sister presented several years earlier with a ruptured left IMA...