The "heart appearance" sign in bilateral pontine infarction.

Background: Although rarely seen, bilateral anteromedial infarction of the pons demonstrates the characteristic "heart appearance" sign on magnetic resonance imaging (MRI). This sign has hitherto been described in only 2 patients before this article. This typical pattern can be attributed to atherosclerotic or thrombotic involvement of bilateral paramedian and short circumferential pontine arteries supplying the anteromedial pons.