translation.en: At the time my patient posed this question to me, breast density was an obscure topic in the radiology literature, and very few women having mammograms, or the physicians ordering them, knew about this.
translation.zh: 当年我的病人问我这个问题时， 乳腺密度在放射性学的学术界 还未引起重视， 很少有接受乳房X光造影诊断的女性， 或者使用乳房X光造影诊断的内科医生 了解这一点。