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Missed Breast Lesions Found After the Fact

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Ikeda says that "70% of these cancers looked normal." Birdwell says that it is unclear if any of these cancers could have been identified using any other technology. She says, for example, that most persons who advocate the use of ultrasound say that the ultrasound approach should be used in women with dense breasts. In the cases she and Ikeda presented, half of the women would not have been selected for ultrasound screening because they don't have dense breasts.

While Birdwell says the findings suggest that mammography is far from foolproof, she adds that the good news is that all of these women did eventually have their cancers detected by screening mammography and even invasive cancers were at a very early stage and very treatable.

Vital Information:

  • Although it is difficult for radiologists to find cancerous lesions in dense breast tissue, half of all missed lesions occurred in non-dense, or fatty, breast tissue.
  • There was nothing unusual about the types of lesions that were missed, leading one researcher to suggest that mammographers were just distracted in the screening room.
  • Some institutions have two reviewers read each mammogram, but this introduces legal issues, such as which person will have the ultimate responsibility in the reading of the film.
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