“…Although seat belt injuries are common, intramammary hemorrhage is rare, and no treatment strategy has been established. In Japan, for example, conservative treatment, surgery, and TAE have been reported in patients with and without shock [3,5,6]. Intramammary bleeding can cause shock and compartment syndrome as in previous cases and in cases of the present report, and active bleeding as described in the classification established by Majeski [2] should be considered for aggressive therapeutic intervention.…”