Vascular surgeon John Martin was feeling some discomfort in his throat. So he decided to investigate the problem by testing out a pocket-sized ultrasound device, created by the Connecticut-based Butterfly Network, where he is chief medical officer. According to MIT Technology Review, when he used the Butterfly iQ, a hand-held imaging machine for ultrasounds that is compatible with the iPhone, he discovered squamous-cell cancer after running the probe across his neck.

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